"Hasbro's toy sales are down so they're trying to wring more money out of D&D"
"why are their toy sales down? did a show with a weird freak burst of popularity among an older fanbase with toy-buying income end a couple years back or some-oooooooh."
there are other factors, but
A) I would argue that a sudden new audience fading away definitely hit their bottom line a good amount and
B) it's much funnier to say this is all Princess Celestia's fault