One of the best known features of the new RMAH is that it allows players to effectively "Cash Out" of the game when they are altogether finished with it.
For example, someone might play to Inferno or perhaps even beat Inferno and decide that they are no longer interested in playing the game. To compensate themselves for their time, they are able to sell all of their primary gear for real money via Paypal (or Blizzard bucks, for those who are interested in investing in other Blizzard games and such). In my humble opinion, this is the greatest feature of the new RMAH, allowing players to "pay themselves back" for their playtime in a sense.
So, have you "Cashed Out" yet? Will you ever?