Pete, I'm thinking you're probably going to see him in the future. If you still feel this way when you see him you could do whatever you think.
In the meantime, you did what most guys wouldn't do. You helped a complete stranger who knocked on your door asking for a longshot maybe. That's totally commendable my friend and he wanted to reward you for being you.
Don't feel guilty but follow your heart when the time comes if your in the notion and not cash strapped.
By the way....I'd like to knock on your door when I need help too. Inspirational.