With summer jobs in short supply, more young people are pursuing money-making opportunities in Web fantasy worlds. Alexandra Alter on the new online workers. By ALEXANDRA ALTER While his friends scramble for jobs flipping burgers or bagging groceries this summer, 18-year-old Mike Everest will be working as a trader in the fantasy Web world of Entropia Universe, buying and selling virtual animal skins and weapons. His goods exist only online, but his earnings are real. In the past four years, he's made $35,000.