the idea would be to give up a VERY small sliver of your upside in hopes of participating on other wins.
I understand founders' desire to "maximize their upside potential", but if you cash out for 100mm, the incremental 5mm you give up has relatively small utility after the 95mm you cashed out.
However, in the more probably 0 dollar scenario, the shavings of the successful startups will be a nice hedge. Probably won't pay your bills, but better than zero.
Hopefully you pool with a group of founders that increases your expected utility (not dollars).