Sorry for not responding sooner. Hacker News needs an active message flag like Reddit has.
The first one (flownet.com) failed. Never made a dime. Never found an investor. But we had working (hardware) prototypes.
The second one (indiebuyer.net) made some revenue but ultimately ran out of money and folded.
The third one was acquired by Richard Branson and is now Virgin Charter. (That wasn't an exit, so I still haven't made any money from it. But it's looking promising. At least it's still in business, and doing well last I heard.)
The fourth one is looking pretty promising as well. (Actually there's a fifth one too, which is also looking pretty good.)
So I've been at it off and on for fifteen years (we started FlowNet in '93) and I still haven't made a dime off a startup of my own. But I think I'm getting better at it :-)
