How is it possible to sell code written in an interpreted language?

Question

It seems to me that if you are writing in an interpreted language that it must be difficult to sell software, because anyone who buys it can edit it/change it/resell it without much difficulty.

How do you get around this? I have a couple of PHP apps that I'm reluctant to sell to people as it seems that it's too simple for them to change/read/edit/sell what I've produced.

Answer 1

Hardly anyone sells code. We sell the ability to create, edit, support and understand the code.