The advantage in this case is that the investments are not returned so quickly, and the funds won at the rates - you get immediately
You're right, but if project is big enough and promising it's better to invest money then bet because investment is more safe.
How is it even possible to compare bets and investing in the ICO or any other projects. This is an ABSOLUTELY different things. The only similarity between them that you have a chance to multiply your capital, that's all.