I don't think betting the house on a single event is "insane". Businesses make these all-in bets all the time and we're fine with it. Every Hollywood blockbuster is also a billion dollar all-in bet, but nobody bats an eye at that either. Individuals bet a huge percentage of their net worth when they buy a house. Yet when a person invests a large amount of their net worth in a single stock it's suddenly irresponsible? Hogwash.
The way we perceive risk in society is extraordinarily polarized. Some moderately risky behavior is considered normal, and other moderately risky behavior is deemed "insane". I don't think there is any rhyme or reason to it; just a matter of arbitrary cultural norms.