I've been thinking for years they should do something like those World of Springfield little playsets. Include an army-builder with each one and we're talking business.
I think if they looked authentic, they could go for $25.00. Start off with the OT stuff and throw in some random Prequel stuff in there too. Imagine this -
Death Star sets -
- Detention block w/ Death Star Trooper and circular command console
- Detention cell w/ Stormtrooper and torture droid
- Red Control Room w/ Imperial Officer and chairs
- Death Star Hallway w/ Tie Pilot and black astromech
That would just be for starters. Test the market with those. Even randomly mix in those three trooper builders throughout the sets. Once those go like hotcakes, explore into explanding the Death Star. And yes, these would interlock universally with each other. You could stack them, connect them by the sides, etc. Eventually make a hangar for the Falcon.
Then, make a cool ROTJ addition w/ a throne room and Emperor figure.
Keep it going... Hoth would be good, so would Bespin and perhaps some mini sets like the Cantina.
See where it takes you and then dab into the prequel trilogy some. Mainly ROTS though.