Eli5: Why can’t you just double your losses every time you gamble on a thing with roughly 50% chance to make a profit

Question

This is probably really stupid but why cant I bet 100 on a close sports game game for example and if I lose bet 200 on the next one, it’s 50/50 so eventually I’ll win and make a profit

In: 4566

Answer 1

I did this at the Runescape dual arena which was a legitiment 50/50. Worked great was making a ton of cash. Then I lost 23 times in a row and was bankrupt.