This is intended to be an online service geared towards a humanitarian cause. Your reference about mocking things up and asking people is a really good one. I've been validating the idea by asking people questions through interviews and surveys and so far I have a good feeling about it. I'd be doing mockup validations too but as this is a service and not a product I may defer it for a bit (or not).
I'm with you on not wanting to create a company yet, but I wanted to know how practical is it to accept money into one's personal account? I obviously don't want to risk my personal assets but I also realize creating a company could be unnecessary hassle/expense. I'm trying to sort that confusion.