Please be aware that I am a VERY VERY low volume computer seller. Ok, sure, I can RMA defective parts, which I will do after I have to drop my prices to 1350 as I make, again, almost no money.
The thing is that a RMA often takes weeks, and some people would be mighty pissed if I had to hold their product for a few weeks because I have to RMA a bad part etc etc. Well, that's where I am coming from.
the margins are too small for you to make a profit - why do it if you're not making any money?
if you have an account with a supplier, your RMA gets processed according to the terms of the contract. You can't compete on price and turnaround if your supplier is tigerdirect.
Finally, I saw in one of your other threads, you posted an invoice from Tigerdirect w/ your parts costs, you're asking for way too much of a mark up on something that requires no special skills.
you must differentiate your product to justify asking for a higher price. you can set whatever price you want, if you can show the customer value for money. Apple does it, Lenovo does it, Asus, ATI, and nVidia do it too.