Kiblinger says he has repeatedly gotten threatening letters from the Entertainment Software Association suggesting he is selling goods he doesn't own.

FORBES: Holy Cybersuit!

West Virginia entrepreneur Robert Kiblinger has a thriving business selling castles, characters and other items accumulated by players on games like Ultima Online.

FORBES: Holy Cybersuit!

"If it took a player five years to get his hands on a castle, that's a lot of time devoted to the game, " Kiblinger says.

FORBES: Holy Cybersuit!