Upsetting the System

New game idea: F2P MMO (overbloated already!) in which all cosmetic items are free, but the gameplay is going to cost you. You can /walk, /talk, and /attack, but anything else costs real-world money. /jump is $1. Special attacks are $3 apiece. $20 to fly. Dungeons, lands, weapon proficiencies. Money, money, money. Because why should the people who like to look pretty front the costs of everything?