People have been gambling for millennia. Most of the people who have lost bets have done so without killing themselves. Much can be learned from this. For example, that killing yourself is worse than not killing yourself. This intuition is one that should follow over to ‘quantum’ gambles rather straightforwardly.

You weren't one of those people.

That non-ancestor of yours who played Quantum Russian Roulette with fifteen others is dead from your perspective, his alleles slightly underrepresented in the gene pool. In fact, if there was an allele for "QRoulette? Sure!" that had caused these 16 people to gample, then it had lost 15+ of its copies from your ancestral population. Post-gambling suicide really isn't a good evolutionary strategy.

But, from the perspective of your non-ancestor, he got to live in his own perfect little world with 16x his wealth (barring being crippled--but then, he'd only been up against 4 bits).