Urge to cash in on the housing bubble has spawned an industry of schemers: Every boom has a dark side. The merger mania of the 1980s produced insider trading scandals. The '90s stock bubble was busted for biased investment research. And so it is with real estate, the hottest market of the past eight years. The urge to cash in on rising home values has spawned a growing share of hucksters, schemers and rip-off artists. Learn how to avoid ten of the biggest real estate rip-offs or view Video: Real Estate Rip-OffsClick HereSo far, it is tough to know exactly...