How to avoid a start-up guy?
noonespecial: What you've got here is a charity case. No matter whats promised, you're almost certain to get nothing out of the deal.If you think that its worth doing a few extra hours of work to help out this 'old friend' then tell him exactly that and do it without expectation (or request) of any financial compensation. If not, just tell him that you've taken on all you can handle right now. Sorry. Repeat as necessary.