The biggest difference between EVE Online and other MMOs is that EVE players can find ways to establish and run large financial ventures within the game. Although such initiatives aren't developer-supported, players still put together banks, IPOs, and other types of investments peripherally to EVE and its game mechanics.The sandbox nature of the game paired with EVE's API allow for ventures of this sort. Dynasty Bank is one choice that players have that's been turning heads of late, but EBANK is the focus of a recent EVE-Tribune piece.
EVE Tribune had a chance to interview EBANK's LaVista Vista (real name: Charlie Eriksen), who is also a newly re-elected delegate of EVE's player representative body, the Council of Stellar Management. The EVE Tribune piece written by FinnAgain kicks off with one hell of a caveat in the form of a direct quote from one of their staff writers, but it's a good way to begin, particularly given the problems that have been seen in the past with banks in EVE Online. The interview focuses on the policies and safeguards in place to keep any individual working at EBANK from absconding with vast amounts of player-invested ISK, but LaVista Vista also discusses how EBANK puts all that isk to use, and their future plans to establish a stock exchange. If you're interested in the economic side of an MMO, the EBANK interview at EVE Tribune is a good look at what players can accomplish on their own within a virtual economy.