Good .com domains are hard to get, the short brandable ones went years ago, and the few for sale go for thousands at auction. But most of .com sits unused. A crawl of the whole .com zone found only about a third of registered names have a real website. The rest are parked, on for-sale pages, or empty. A lot of it is squatters. Those names don’t stay locked up forever, though. Tens of thousands of .com domains drop every day, often abandoned squatter inventory or a project someone walked away...