Yep; for the vast majority of people, the difference between $45M and $50M is not going to change their lives in any meaningful way. With that amount, you can live a fairly lavish lifestyle and still see the number in your brokerage account go up every year.
I actually kinda think a founder that was otherwise already wealthy wouldn't mind this too much, either: say they already have $50M in the bank; the difference between $95M and $100M feels even less of a big deal than $45M and $50M. Granted, the founder with $50M already in the bank probably wouldn't bother with the $500k in the first place, though, especially if they believed in the likelihood (or guarantee, in your hypothetical) of a future larger exit.
I actually kinda think a founder that was otherwise already wealthy wouldn't mind this too much, either: say they already have $50M in the bank; the difference between $95M and $100M feels even less of a big deal than $45M and $50M. Granted, the founder with $50M already in the bank probably wouldn't bother with the $500k in the first place, though, especially if they believed in the likelihood (or guarantee, in your hypothetical) of a future larger exit.