FWIW, he's doing NES ones now (
example). He seems to charge more for his NES ones given that he has to modify them, but still, what a prick. Although, if someone needs only one case I guess it's easier to just do this than to buy a single UGC and have a single label printed once you factor in shipping (and paper/ink costs, although nobody who doesn't already own a colour printer would buy one just to print out a single label).
And yes, looking at his feedback, he's sold quite a few. I wonder how much I end up spending on my cases. My paper is .30/sheet (3-star glossy from Epson), UGCs are roughly .50 ea after shipping, and if I had to estimate I'd say I can get about 40 labels out of a pack of Epson ink (depending on how many I print, obviously...SNES labels, for example, use much more black than any NES Jaleco title would) which costs about $88 for a full colour pack plus black (free shipping from Epson at least), which comes out to $2.20/sheet. So my cost would be roughly $3.00 per case, all tolled. He offers free shipping, which for a First Class Mail package that would accommodate a UGC would be about $2.00.
So yeah, he's pulling about $6.00 per NES case he sells.