I seem to have the number 1% as the success rate in my head.

Doing some Googling gives a number like 10% success, but it's not clear whether these figures are only for companies that received VC-funding.

So actually, I'm not sure. Point taken.

It's probably easier to make lifestyle businesses pay off. And how is success / failure defined? I can imagine failure might mean that the VCs didn't make money? Then it could still have been worthwhile for the founders.