I face the opposite problem. I used to be a professional investor, so founders know you have the money.
Founders assumed I didn't understand or didn't care about money, so asked for unrealistic amounts of investment and seemed perturbed when I ran the numbers with them to show them they couldn't afford it.
The funniest example was this one:
https://mikehardcastle.com/2016/01/13/the-founders-a-test-of-common-sense/