Parmandur
Book-Friend, he/him
I don't think it's a fair comparison. If WotC published a dozen new 32-page D&D books every single week, I'm sure it would drastically affect the sales figures of individual books. Comic books are just a different model.
The context was Jim Zub saying he's trying to convince other comic writers to get into a growth industry like TTRPGs rather than comics.