1) Second life is a game, and cannot have the kind of real incentives to have any real meaning to political philosphophies.
If by incentives you mean money, before the mods banned a slew of activities, SecondLife was quickly growing an economy based around entertainment and service businesses, as well as financial systems. There were casinos, clubs with paid performers, trivia games with cash incentives, escort services, meeting places with custom architectural designs and services, theaters where people could watch streamed movies together, security groups, sophisticated property defence weapons, banks, networked retail/POS systems, financial service providers such as lenders and accountants, and even the beginnings of an in game stock market, similar to the GLBSE. People were making real money in the game (I bought my $750 smart phone back in 2004 entirely from financial service business gains). In short, it was almost like a 3D version of bitcointalk.org with its own Bitcoin, before the mods reminded everyone that the forum and the currency are centrally controlled.
2) Secon life is, from what I understand, already almost an anarchy.
Only in regards to what you can build and sell, and even then only to a point. Rules and regulations are still strictly enforced by the mods, all in game content and activities are regulated by US laws, and all gambling, financial services, and interest bearing accounts, as well as certain programs, are banned. That pretty much cut the beginnings of its economy just as it was about to explode. Having the place user-modded as opposed to whining to and depending on the mods, plus allowing people to set up their own laws and rules, should make it much more interesting, too.