Stripe is one of my favorite startups with a valuable solution and we use them for our client sites and our own products. To me though they didn't do something that hadn't been done before, what they did do was take a pain in the ass problem and made it stupid easy to solve. I am sure they have some amazing technology especially on the fraud side, likely something that could be called revolutionary, but in the end they started by solving a problem that wasn't new, just painful for everyone.
BTW -- not trying to take anything away from Stripe, but other players were already in the market with payment API's before they started. So in that since they aren't revolutionary in my opinion.
Thanks a lot for replying, really helped me to think further on the meaning of idea itself.
In the end its all about creating value for other people, and then convincing them to pay you a part of that value for your product or services. So problem solving is what pays the bills. But big vision is what gets people excited.
Ideas become revolutionary only in retrospect, when the product or service becomes so good that it becomes obvious that this is how it should have been done. You may be associating the term "revolutionary" with solving a difficult problem, like nuclear fission or biotech. Obviously the more difficult the problem, the bigger the payout. Scale seems to matter, because we wouldn't call marginal products revolutionary.
A successful startup is one that solves a problem, and (eventually) makes money.
Solve a simple problem, and it will not be.