You can try and I'm sure you'll find someone that accepts it but I won't be your customer. As a customer I want ownership of the code, to be able to fix bugs and add functionality without having to go back to you. In a few years you might have changed field of business or be too busy or too expensive to work for me again. It's a risk I cannot accept.
That said, for small trow away projects I could accept that you keep the IP but I'll want a discount (to remark that I don't think this is the normal way to do this business: photos != software).
He/she didn't say that you can't have the source, just that you'll have to pay extra for it, separate from the payment for the time/effort/knowledge the initial development took.
That said, for small trow away projects I could accept that you keep the IP but I'll want a discount (to remark that I don't think this is the normal way to do this business: photos != software).