Maybe I see this the wrong way.
The reason the PL is so marketable isnt because United play City every other week. Its cos its competitive. With several well branded/nouveax riche clubs, with a wide fan base, being a bigger draw than Burnley. Or us, currently.
But the genius of the PL is that its a collective organisation. Being a member of the league, by default, catapults any clubs global reach.
Exhibit A. Leicester City.
If a German version of Leicester had won the BL, would that have captured the imagination of the sporting world? I doubt it.