Honestly I dont agree at all to give the code to the customer. If the customer whants the source let he pay a bit more, but be shure that the source is somehow protected, use a smart way of having your code hard to understand by other coder. When i have to release the source for a cliente i usualy remove every coment of the source, and make it as hard as possible to understand even if the compiled version is not the same as the source one, cause the compiled version is maded with the comments and well structured but is for my use and my use only. Customers have rights but so do coders...and all the programmers I know, most of them dont give the source at all.

Read some nice book, play airsoft, whatever works to relax after a working day