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I've been playing MMO since before the days of the run 'n gun, fly by your pants sort of thing. This is back when, and from a broad experience everything can be said to be evolving. We see this feature or that game shift or add this or that and we buy it to try it out.
That's ok (though some may say its not) but in either case its not what I wanted to talk about. Let me give an example, an analogy. At subway you can buy a certain footlong sub for $5. Or you can buy the same sub but only half that size (half a foot) for $4. What reason could you have to buy the half a foot?
1) You only have exactly $4 to spend on lunch, not $5. In this case I suggest you NOT buy a sub at all if you only have $4. There are many cheaper lunch options.
2) You aren't hungry enough for whole sub. Ok then why not save half for later?
3) You aren't aware of the small price difference. Well now you are, you can no longer use this as an excuse to buy only half a sub.
Those are the ONLY 3 reasons I can think of. Someone please feel free to add another if you can think of one. There is no need to flame/troll if I missed a reason you can just politely explain why you think there should be a 4th reason.