Again...because when you advertise Dracula, people expect more than a cameo.
I do agree with
@DodgsonHere about drawing power, though. That said, it wouldn't be a great look for the brand if they kept going into that well, either. Drac def needs a break, but I could see a scenario where Frank is back. IMO, the best foot forward is to diversify. I think Phantom may be a nice change of speed, and is known enough despite being a "secondary" Monster.