illegal: yeah its return fraud, but only if you get caught, which there is no way to prove it unless you admit to it yourself
immoral: morality arguments can go back and forth forever, being a former (non-disgruntled) employee of gamestop, it doesnt tread on my moral fiber, but i can see how one would get their panties in a bunch over it.
terrible advice: absolutely not! the best advice given on this thread, until it was noted that the disc is an HD-DVD copy of T3 (seriously wtf?! you care that much about T3 on HD-DVD to create a thread about repairing it, you said youve watched it once, that should be enough to know that you never want to watch it again, but to each is their own... i guess...)