I have. Many of my business ventures never made money.
Am I a failure? Sure, if you can call someone who makes 6 figures online a failure, go ahead ;)
It's a numbers game. On average, about 1 out of every 4 of my business ventures makes any significant money. But when it does, it's an automated income stream.
When a project turns out to be a loser, I dump it and move on to another one. I don't take it personally... it's all a part of the game. I keep developing different project ideas until finally I come across yet another winner.
If I gave up after my first business failure, I'd still be a corporate cubicle dweller :)
Repeat it like a mantra: business is a numbers game. Eventually you'll hit a winner. And as you get more experienced, your ratio of winner to loser projects will improve as well.
To Your Success in a Blink,
Mxxx Mxxxx