That's probably because it does depend. Pricing in any kind of isolated market is very very difficult because you cannot use pricing data from elsewhere. Each virtual world is, effectively, a highly isolated market and the products you're selling can't really be compared to other markets.
In the end, you just charge what you think the market is willing to pay. We set a lot of our initial prices by auctioning things off and seeing what they were worth to people. From there on out, we just draw on our experience to inform our pricing decisions.
--matt
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