There is no correlation between skill and wealth. If the game is restricted to 'serious' players (those willing to pay serious money), then there would not be enough players online to group with or show off gear to. The game would be forced to go F2P to increase player numbers, which would mean more 'poor' people playing. Among those there would be some who make it through the game by sheer skill instead of relying on stuff bought in the cash shop.
Anyone remember the video from AION about power levelling? It went something like this:
Tank: "I'm taking a lot of damage here, could use some help."
Healer: "Hey, did you guys know we've got wings?"
(I know this is a troll/sarcasm thread, but hey, whatever.)