As an Angel investor , the reason I invest in a start-up is because I believe in the founder . I feel that he has a product which can solve a paying customer's pinpoints , which is why I hope he will make me a lot of money in the process of running his startup. During my due diligence , I am quite likely to establish an emotional connection , and I try to be an observer on the Board, so I can continue to learn from him. This means that as an angel , I will have a personal relationship with him, which goes over and beyond our business relationship . The question is - is it a good idea to become friends with the founders you fund ?