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If you look at what you can get for $15 a month in many other MMO's, it's amazing that people still feel good about what they get for their monthly sub in WoW.
For example, if you sub to Rift you get treated like a king and really feel like Trion appreciates your $15. Among other things, you get daily, weekly, and monthly bonuses, currency to use in the cash shop and pretty much any game related service is included (ie. realm transfers).
The same goes for SWTOR. Paying a sub in SWTOR gets you a lot of perks along the way but also includes the DLC / expansion content and even early access to many features.
Now look at WoW, you pay $15 a month and it includes absolutely nothing but the right to play the game, you still have to buy the core game and the latest expansion in order to get to level cap. On top of that, you're looking at additional costs for pretty much any game related services including realm transfers ($25?!?!), name changes, race changes, etc.
I've played WoW since launch but I'm really starting to feel like Blizz is simply milking the remaining player base as opposed to showing any appreciation for their business.
Look at WoD, we essentially played through most of the zones 7 years ago yet somehow we're supposed to get excited to play through them again and while we're at it, cough up another $50-$70 to do so.
I appreciate the cost involved with building a quality MMO but we're seeing plenty of other developers who are able to provide AAA quality games without having to nickel and dime us on every little thing. Look at ANet, they put out an amazing amount of quality content for a one-time purchase price.