Seems low to me as well. They took 6MM in Jan '07. The only way a 50MM exit seems great (for the VC or angel) is if they got 50% for their 6MM. If they had an average 20-30% Series A, thats around a 2.5X exit... which isn't awful. It's possible after 4 years given a 50MM offer, that they either a) ran out of money b) their VC had control and wanted out or c) they didn't get a counter offer from EHarmony, et al.