Ever since I made my cart system free, I have had people asking me for my source code. They say that they want to look at it to help me fix whatever issue they have, and that they have however many years of experience, etc.

The thing is that the issues they come up with are usually trivial, and often due to something that they do rather than something my code does. I'm trying to be nice about it but I'm starting to get annoyed.

Sure the site is free but that doesn't mean open source.

Does anyone else get this and how do you handle it?