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I think you mean: If you didn't bet on the roulette ball balancing on the divider between numbers, would you say "God damnit I feel like an idiot, I should have bet on that!"

The odds of a cryptocurrency catching on the way Bitcoin has are very low. Buying BTCs (or other cryptocurrencies) back in the day would be like investing in penny stocks.

EDIT: For the record I agree with you - there's no point in looking back and saying "I should have done that!"

I guess what I'm really wondering is: just know that Bitcoin existed already put me in the minority. Was there something I should have caught on to that would have told me that it was going to succeed? From this and other answers, it looks like that is not the case. Thanks.

I don't feel bad about not having invested in it at the time. The only way I would feel bad now is if I had invested, and then sold it before it reached the height of today.

You never know how it's going to develop. I once sold Apple stock after getting 40% profit in a few months. Should I have known that it would continue to climb for a few more years? Usually, getting out while you're ahead is a good idea. It's often better to sell to early than too late.