900 satoshis isn't very much and it seems that the site has already been running for about a year. Gotta admit the purpose of the site was a bit confusing at first. I could see that it was an economic game of some sort but there wasn't much information about how exactly it works and whether the things traded there are "real" or not. I found this article to be quite helpful:
http://onbitcoin.com/2013/11/13/goodbye-second-life-hello-bitcoin-new-economy-seventh-continent/So basically, it's like Second Life - i.e. a virtual world where you can earn money by selling online wares. Second Life was able to create a $500 million internal economy so the idea is that Seventh Continent will do the same for Bitcoin.