Have you actually modeled out the potential payouts?
How did you choose the 1% number (percent of their equity that each founder contributes) as well as the pool size of My quick back-of-the-envelope calculation:
Expected payout to each member would be:
1% * avg_valuation_of_companies_in_pool * avg_percent_ownership_at_exit
Assuming an average valuation (in the literal sense, total exit value of all co's in the pool / number of co's) of $100M [2] and assuming that the founders own roughly 15% at exit, the expected payout would be only $150K excluding taxes, which seems quite low.
[1] Modeling should be somewhat doable leveraging public data. For example, you can use YC company data in https://ycombinator.com/topcompanies https://ycombinator.com/companies and simulate what the payouts would be if you were to choose 25 companies from a given batch at random.
[2] $100M is likely in the right ballpark. According to https://www.ycombinator.com/ :
> Since 2005, we've funded over 2,000 startups.
> Our companies have a combined valuation of over $100B.
the average valuation of YC co's would be ~$50M; if you exclude half of those that are in recent batches (haven't had time to realize their value and don't really contribute towards the $100B total) it might be closer to $100M.
Under a FounderPool model, an example of this would be a pool of 20 co's in which 2 companies end up exiting for $1B each and the rest essentially $0.