Even this site is maybe a good example. You can apply to YCombinator with little more than a partner, plan, and pitch. The worst that happens is they say no, and if they say yes then you get a $500k funded shot at your idea with lots of advice on top and people trying to help you succeed. Yeah the chances of acceptance are low, but if you've ever read applications for pretty much anything, a ridiculous amount are just complete garbage, so your chances are better than the numbers suggest if you're halfway competent.