Honestly, the value proposition from WoW has gone down in my eyes in the past couple years. Spending $15 a month in any of the several quality F2P titles out there typically gets you more than the $15/mo that is required just to play, and the only reason WoW isn't completely blown out of the water in this respect is because they've had over 8 years to develop a backlog of content that people can spend time in. More and more F2P/B2P/subcriptionless games are letting you access all/nearly all of the content for free and putting vanity/convenience in the store, and a few are even letting you earn these same cosmetics/conveniences in the game if you so choose.
In terms of what you get for $15 a month, there are several good options out there that offer as much or more than WoW does for the same price, so yeah...the value proposition has definitely gone down. Throwing convenience micro-transactions on top of it - which, unlike the one time purchase mounts and pets, are meant to be purchased repeatedly - not helping.
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