Pre-sale investment certainly has the potential for high profits, but you also need to know that the risks are also greater... your parable is the best version, so the worst version is that when the pre-sale period is over, events that are beyond our expectations also sometimes arise... such as developers running away with the money they get, presale moments not getting enough money, regulatory problems, listing problems on the stock exchange and many more... when they are still babies, or you could even say they are still in the fetus (I make an analogy for tokens that are currently on presale )
Personally, I prefer to invest in coins that are more common, meaning I choose when the coin is already listed on the exchange.