After reading a few blogs on the announced D3 RMT I feel .. empty.
You might think that I hate it, but actually, no. Diablo 3 is not a virtual world. It is just a game. And apparently I can play solo and I can ignore the RMT. So .. I don't really care. Perhaps I can make a bit of money by selling stuff - probably I won't play D3 long enough for that to happen.
What's bad about this is the influence it does have on virtual worlds. But I can't imagine at that point that Titan is supposed to be a virtual world, anyway. It, too, will be just a game.
I could care less about the requirement to always be online. For me that is a holy war some people fight there. I am always online anyway. And I don't usually play games when I travel or have no access to internet.
I generally am skeptical of player-made mods. A few Elder Scrolls mods were good, but mostly I don't get much fun out of these things. To be able to change the rules of a game by downloading a mod feels wrong and arbitrary.
One last thing about the RMT AH: One big problem game companies are faced with when it comes to MT is how much each thing should cost. By having a player-run market pin-point optimal prices, they not only get the revenue-maximizing price, but also save the work to determine a good price themselves. Taking some percentage off that market-price feels better, too. And it doesn't disrupt the in-game economy.
Of course, I won't play together with anonymous players in D3, as I couldn't respect their equipment or avatar. But I never planned to play D3 multiplayer, anyway. It is just a game.