The real issue for NewEgg is probably whether you've blown away the Windows restore partition. Without that, it's probably going to get rejected by their reverse logistics vendor.
This shouldn't be the customers problem, but for them it would be as if a hotel guest took all the sheets off the bed every morning and soaked them in the bathtub - enough people do that, you're going to have to hire extra maids.
I had a Lenovo system from Fry's that I couldn't install NT on. In the process of trying to get the install to work, I managed to wipe the restore partition.
They wouldn't take it back. "How can we re-sell this?"
"It's broken. You can't."
"We can't put this back on the shelf without the restore partition."
I called my credit card company in front of them and had the charges reversed. "Have fun, boys."
I'm sure that some poor sucker got that machine, DOA, and returned it again, with the same hassle.
This shouldn't be the customers problem, but for them it would be as if a hotel guest took all the sheets off the bed every morning and soaked them in the bathtub - enough people do that, you're going to have to hire extra maids.