Blizzard changed the leveling experience at the same time those new characters became available. It used the scaling tech available in its later zones to make broad swaths of older areas available to a much wider level range, so that characters could choose what quests or zones they wanted to do and stay there, rather than out-leveling them too quickly.
101+ At this point you'll start taking a penalty on quest/bonus objective experience for every level past 100. Treasures, however, remain worth their full value all the way through level 105, at which point they'll be worth something like 15% less, and then another 15% more when you ding 106. I recommend that you stop questing/gathering entirely, and collect all the treasures you can stomach, only avoiding any annoying to reach ones inside caves or behind elites/rares(where scaling does bizarro things).
Recently, Blizzard provided their own WoW Token system for players to buy and sell World of Warcraft Gold. However, the constantly fluctuating supply and demand means that prices will vary. Consequently, getting the best prices isn't guaranteed, nor do you know when you'll make a sale. You also can't trade or resell any tokens you buy, as they become instantly "Soulbound".
For the 2nd week of BFA, M+, Raids, and Rated PvP are still not open so there isn’t that much that you have to do. Do your Island Expos to level up your Heart of Azeroth, do WQs for rewards, do Warfronts and the 11 weekly quest turn ins, and run your Mythic Dungeons again to try to get the most gear before reset. I personally will be spending a lot of Week 2 farming mats for consumables for M+ and Raids but whatever you choose to do is up to you.
The Company employs a software technology called clear gifs (a.k.a. Web Beacons/Web Bugs), that helps it better manage content on its web sites by informing the Company what content is effective. Clear gifs are tiny graphics with a unique identifier, similar in function to cookies, and are used to track the online movements of web users. In contrast to cookies, which are stored on a user's computer hard drive, clear gifs are embedded invisibly on web pages and are about the size of the period at the end of this sentence.
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.
Some people have made arguments that quest blues can sometimes be more powerful than heirlooms, especially with sockets. I'm not convinced. The simple fact that you never have to even look at quest rewards will save a non-insignificant amount of time over the course of leveling. Also of consideration is the value of enchanted gear never having to be re-enchanted.
Edit 20 It’s been a week since this post and a lot of people are still reaching out to me with questions which is fine. I have had a few different people reach out to me to help make YouTube videos based off this guide and more info in BFA which I’m more than willing to do. Whoever gets the videos up first I will link them here for you guys to enjoy.
Lastly: The zone order I recommend for Horde is Vol’dun- Zuldazar- Nazmir. Vol’dun is definitely the most challenging of the bunch and having the use of your Legion gear and leggos will smooth this zone out. Nazmir is the easiest of the bunch which is nice when things start to get a little grindy past 116. For Alliance, I recommend Drustvar- TS- Stormsong. Same logic as the Horde side, in my opinion Drustvar is the hardest and Stormsong is the easiest for when it gets grindy. I would recommend you waiting to do any of the War Campaign until you are capped because it just takes you out of the way. I also recommend not killing a single rare mob or picking up a single treasure because in my experience it is just not even remotely worth it. The gear scales up on the rare mobs so its smarter to keep them till 120 anyways. After you are done leveling, I do recommend taking the time to do all the quest at the Faction Outpost in your enemy territory. They do provide rep for the Honorbound which helps. Most of them are quite easy. If you do not level in Warmode, you will usually hit 114 from your first zone, 117 from your second, and cap 120 about 2/3 in your final zone.
Une autre manière d'améliorer grandement votre expérience gagnée par heure de jeu sera de faire l'acquisition de la monture Trotteur aquatique azur auprès de Nat Pagle, en Pandarie, grâce à la faction Les Hameçonneurs. Une fois Exalté auprès de ces derniers, vous pourrez acheter cette monture contre 1250 Po, qui vous permettra alors de vous déplacer aisément sur l'eau, vous faisant gagner ainsi de précieuses secondes. Si vous n'êtes pas encore exalté auprès d'eux, mettez-vous y le plus tôt possible : 15 jours de 3 quêtes journalières avec des bonus de gain de réputation devraient être suffisant !
The community was apparently frustrated with Blizzard for a lack of communication concerning the issue, but it looks like that was due to the fact that their heads were down as they worked to understand the problem. It was explained that they didn't want to just roll out a quick bandage, as that would likely cause unforeseen issues down the road. Instead, they're crunching the numbers and digging into the code in the hopes of discovering a legitimate source of the problem.