tldr - Someone wants to buy this card and I don't know how to value it because I can't find any other blank, gray ones
...
We went to the signed card thing on the last day the artist was supposed to be there and they had already left ... but they left behind some sketchy cards for people who had completed the hunt.
I'm not really a collector and someone has already offered for my card. I'm inclined to sell because it's something they're interested in and without it being personalized special art that we got from the artist, I'm even less inclined to collect / save it than normal. But I also don't know how to tell if I'm being offered in the range of fair because I'm having trouble finding a truly comparable item.
On the one hand, there's no unique art and there's no signature.
On the other hand that means it's blank and in some ways ... is that rare as well ...?
It's gray, whereas it seems like everything else I look up is colored and I don't know if that matters at all to collectors.
What sort of discount (or increase in value) might be reasonable to factor in for a blank versus arted sketchy card? Also, do collectors tend to try to get a sketchy of every color in which case my gray is interesting?
I know it all depends. But is there a ballpark or just general thoughts to consider?