Though related, this is no longer true. You can now purchase a lvl 90 character boost. Some power levelers have hoped for a day when you could use real money to buy individual items in-game, some times called "micro-transactions." At a Game Developers Conference 2008, Rob Pardo gave a strong indication, Blizzard would not ever go this route with World of Warcraft.
EXCEPTION: If you have Mining and only use Jewelcrafting to craft stone statues (for additional in-combat healing), then this may be a useful tradeskill. However, like Engineering above, it should not be a leveling focus and should only be used to assist with power leveling. Doing any more than this will become costly and should not be undertaken during the power-leveling process.
Fully rested experience (this is the blue color your experience bar takes instead of purple) grants 200% more experience per kill. Quest experience does not work the same as mob experience. Instead of just using the rested bonus, quest experience pushes the bar further upwards extending the rested bonus. Say if half your experience bar is blue. If you turn in 10 quests all at one the normal experience from them all could boost a character a full level. Unlike mobs where the experience gain will use up said bonus - the quests merely 'push' the bar further. Doing this could net you a level and still have the 200% bonus for mob kills applying to milk the rest bonus.
Fourth, beginning in Mists of Pandaria with the Halfhill farm, and continuing in Warlords of Draenor with various garrison buildings that produced resources, Blizzard has been making trade goods more plentiful and easier to obtain. In Legion, herbs, fish and enchanting materials were so abundant that a very small population of gatherers could supply more raw materials than the economy could consume.
- Right to restriction on processing. If there are grounds for restriction on processing, for example if you contest the accuracy of your personal data, it will be stored and processed otherwise only if you consent or to exercise legal claims, or for the protection of rights of another natural or legal person. If we have disclosed the personal data in question to third parties, we will inform them about the restriction on the processing of the personal data, unless it is impossible or involves disproportionate effort to do so. We will inform you before the restriction is lifted. 
Un très court paragraphe pour vous dire de ne pas perdre de temps avec les élites rares. Ceux-ci peuvent bien évidemment éveiller votre curiosité et droppent peut être des objets intéressants, mais l'heure n'est pas à l'affabulation pour le moment, mais à l'optimisation, et les élites rares ne donnent pas assez d'XP pour daigner que l'on s'arrête pour eux !
Full disclosure on my time with Battle for Azeroth thus far: I leveled a Horde character to 120 and completed all three Zandalar storylines plus put about 20 hours into end-game content. I have also leveled an Alliance character partway through Kul Tiras and completed portions of the Stormsong Valley and Tiragarde Sound storylines. My only experience in Drustavar has been through the eyes of the Horde thus far.
Usually it's best to avoid a lot of instance runs. It is too difficult to account for bad groups, and some instances are too far away with too few quests. Since the experience is very good, it's a good idea to clear nearby instances which have a lot of quests once (Gnomeregan, Deadmines for Alliance). Distant instances with few quests should be avoided (Deadmines for Horde). Low level instances can be cleared by paying or befriending a single high level character. However, since patch 3.3 a new Dungeon group finding system has been implemented, as well as a direct port to dungeons (when entering the group you get ported to the dungeon and back to the same location if you leave it) and thus the travel time to dungeons has been greatly reduced. This makes it a good idea to complete quests or grind while you wait for a group to become available.
In August 2016, when Legion was released, a WoW token was worth 35,000 gold. Prices began to rise after Blizzard announced that tokens would be redeemable for Battle.net balance, and when the new functionality was released, the price of a token surged to about 90,000 gold. In July 2018, shortly before the release of Battle for Azeroth, prices peaked above 200,000 gold per token.
NOTE: It is VERY important to not vendor any equipment you pick up. You will be deconstructing all of your gear for resources that will help you in the Warfronts to be fought! Deconstructing, or scrapping, your gear will be done using the Scrap-o-Matic 1000 if you are Alliance and the Shred-Master Mk1 if you are Horde. This works the same as the way the Obliterum Forge worked in Legion. The scrapping feature can be used on all Battle for Azeroth equipment found, not just craftable equipment, so save everything you acquire for the scrapper! Before we get started, keep in mind some of the tips below that can speed up your leveling process!
- Right to restriction on processing. If there are grounds for restriction on processing, for example if you contest the accuracy of your personal data, it will be stored and processed otherwise only if you consent or to exercise legal claims, or for the protection of rights of another natural or legal person. If we have disclosed the personal data in question to third parties, we will inform them about the restriction on the processing of the personal data, unless it is impossible or involves disproportionate effort to do so. We will inform you before the restriction is lifted. 
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