Altering and selling sketches for resale in my opinion is wrong. It hurts in the integrity of the product. . . I've written plenty plenty on the subject as this has been going on forever.
That said there is clearly a big difference in the quality of work you can pull out of various releases. . . Buyers, especially a big buyer like the seller of this card, know that when they buy boxes. . . They know that you can pull a poor sketch out of a Topps product, yet they still buy it, and justify altering the card because of the quality. . .
If the buyers don't like it they need to make that clear to Topps, which so far they've been unwilling to do.