In defense of provenance, I Do think its cool to capture the history of our hobby. Just not on the objects. As many have said, I would record it elsewhere, and pass it along.
To answer the OP's post, unless it was a must-have piece for me, I probably would pass. I don't like autographs on comics either, generally. I certainly don't want scrawl on the cover of a key. I'd rather have the autograph separately, and only if it stems from a meanginful personal encounter. (Standing in line to fork over money does not meet my criteria of a meaningful autograph.) But that's just me; I know there's a market.
Cool creator, signature inside the book, book not a major key or rarity, I can live with that.
I'm thinking as I type here --- kind of apples and oranges, perhaps, as I would not mind a creator signing a piece of OA -- in the margin.