Entrepreneurs in record numbers are setting up shop on eBay, according to a new survey conducted for eBay by ACNielsen Media Research International. More than 724,000 Americans report that eBay is their primary or secondary source of income. In addition to these professional eBay sellers, another 1.5 million individuals say they supplement their income by selling on eBay, according to the July 2005 survey. In the last six months of 2005, eBay members...