WALNUTPORT, Pa. - Mary Jo Pletz was really, really good at eBay. But now the former stay-at-home mother and gonzo Internet retailer fears a maximum $10 million fine for selling 10,000 toys, antiques, videos, sports memorabilia, books, tools and infant clothes on eBay without an auctioneer's license. An official from the Department of State knocked on Pletz's white-brick ranch here north of Allentown in late December 2006 and said her Internet business, D&J Virtual Consignment, was being investigated for violating state laws. "I was dumbfounded," said Pletz, who led the dark-suited investigator to a side patio area, where he grilled...