Who the fuck are they marketing to?? Who gets together on a project like this and says "You know I don't think we've quite cornered the adult diaper fetish market enough".
I wondered this to, but i think there are people out there who genuinely like their porn to have a plot and be more cinematic, with stuff like that big-budget Pirates of the Caribbean porn. Wood Rocket seem to be the Jason Friedberg/Aaron Seltzers of that genre.
So, i dont think these are intended to appeal to any particular fetish other than weirdos who need on-screen boning to have context.