Things like Tauren melee reach being bigger, which is something I experienced going away live during Black Temple Illidan progression (at least for that particular encounter), is confusing to players as it's a significant advantage over other races in some instances. No quest tracking is another apparently confusing issue, as many Mankirk's WIfe seekers well know, and there's a whole lot more where that came from:
You create a meta where you're constantly buying gold. Gold is very important in vanilla consumables are the difference between being a hardcore raider and being a casual. The notion that wow token doesn't create inflation is incorrect. By giving every player the ability to buy gold you're increasing how much gold your average player will have. the 1% rich player who has the ingame gold to buy these tokens was not trading with that gold. But now they buy ingame time and the gold that was sitting in their pocket is now being used to trade, buy items, herbs, etc. now there's more gold in circulation. Now everything costs a little bit more gold. And if you're a player who's not buying wow tokens with real life money you have to farm just a little bit longer to compete. That's why wow token is bad. 
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