"Mann is one of the longest members of the clubby world of domain speculators, and he's buying up names in force these days. I wouldn't bet against Mann. Nor would I suggest trying Domain Buying at home."
"Mike's been unstoppable. He built up a company called BuyDomains that he sold in 2005 for $80 million. Now he's set up DomainMarket.com, a business that brings in about $400,000 a month."
"...It's not all complete guesswork or computation, either. While much of his business is automated, using filters to pick out domain names based on Google-friendly keywords, in the end Mann actually chooses which domains to buy."