Most of us usually dont like to spend our money on expensive in-game items, especially if they are only cosmetic. But sometimes we can afford to splurge a little, although likely not as much as the people who bought the items on this list.
A quick warning: there have been many more expensive in-game items sold (like Planet Calypso in Entropia), but since they had actual use and provided players with an added experience, we wont be counting them today.
Source: N4G PC The 3 most expensive cosmetic items in games ever