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Anecdotally, while 9/10 people with obsessive traits may crash and burn and possibly end up homeless, 1/10 may succeed spectacularly by becoming obsessed with something healthy-ish, or something that benefits people other than themselves. (Even if it's at the expense of their family and friends).

How many addicts crash and burn before reproductive age?

It's not a genetic issue, it's an ecological issue. I imagine almost all humans can become addicted to something or develop mental health issues under the right (wrong) circumstances.

Same reason some young men play chicken with traffic. Paradoxically, it's likely a signal of fitness. A young man who can still manage sex successfully under the burden of multiple addictions probably has decent genes, cardiovascularly speaking. Probably why men are much more likely than women to take such risks, too.