Being the professional, sometimes we can look at a project and see area's where money can be saved. We "build" and "install" this on a day-by-day basis. We know what itemms cost more or less and what items don't.

I agree we should be compensated for our time and effort in helping save money. You don't have to give back all the money saved. You are entitled to a portion for doing the extra work in "re-designing" the work or changing brands on some of the products.