Starting a start-up will risk your marriage in plenty of other ways besides financially.
And those people wouldn't be willing to go all out killing themselves like the start-up myth around YC funded companies seems to more or less ask for. That's self selecting to some extent because one of the demands YC makes (drop everything and move here for 3 months) only applies to young or at a minimum fairly unattached people willing to take a fairly large risk in return for a shot at a potentially larger success.
Founders with 'lives' are a lot less likely to take that plunge, even an 80K investment would not be enough to provide the required security for a team of four to get to the break even point, after all that depends not on the size of the investment as much as to how long it will take you to get to 'ramen profitable' and that point is a lot further in to the future than you'd be with 3 or 4 'cheap' people.
The problem is to get monthly income to become greater than monthly expenses, and to get people that would require more payment during the launch phase the whole picture becomes terribly unattractive as long as there are plenty of young guns willing to try it for a lesser take home pay.
Their chances of success are better, they are less demanding and they probably have more energy (even if less experience).
You are in direct competition with them and I don't think that from an investors point of view there is an incentive to change the formula if it already works. The chances of those larger investments tanking is just as large or larger as it is with the small ones.
And a nice side bonus is that younger people are less set in their ways and more likely to listen to good advice.