Most of their users are quite secretive. I've heard they are cypherpunks. And many seem to be rich or people working on behalf of a rich person. But, because not too many people talk about their MPEx activities publicly, it's hard to tell.
Well you can always hang out on bitcoin-assets
Or just read some of mirceas stuff on Trilema (Speaking of thanks for reminding me to check what was going on with Satoshi Minigame they are actually delivering a product)
As previously announced, the next version of Eulora is still on track to go live later this month. Unlike the previous release, this will be a beta version, numbered 0.1.0. Most of the game mechanics will be presenti, and in general it is our expectation that the world of 0.1.0 will attain permanence.ii