The $10k per day number is only interesting if you understand the marketing numbers. If he's spending $20k per day in marketing, the business isn't that interesting.
I have a feeling its mostly word of mouth and a high ranking for 'dating site' in google
[0] http://onlinepersonalswatch.typepad.com/news/2006/01/plentyo... [1] See comment from Reddiance http://plentyoffish.wordpress.com/2006/12/29/yahoo-to-surge-...