So what you're saying is, you were too lame to even successfully grief people in Second Life? The easiest place ever to do it, with the weakest moderation, where you can even script things yourself? *Dude*.

They don't put a direct value on the L$; they run a currency exchange strictly between users. You can't buy L$ from LL except by getting a premium account, which gives you a small amount of them every month automatically (considerably below the exchange rate for the cost of the account). They do print the money on the other hand, and they do try to manipulate the exchange rate by doing that, but they don't control it directly.