If you have the bucks, it'll sure be pretty when it comes back. It is a matter of asthetics. The math is pretty simple: you'll spend some bucks getting it beautified; but, selling the gun as is will net you so much. Getting it reblued will net you that, plus the added value of a reblue.
So, you can shoot an ugly gun and sell it, or you can shoot a pretty gun and sell it for more, but you'll net the same, figuring that the only added value will be what you spend on it.
I'd rather shoot a pretty gun.