So you can see as a tourist where you might want to get off the bus and explore.
Have the windows (transparent LCD screens) show interesting information on places as they pass by or about to, so you can decide to get off when you see something interesting.
To attract the masses and sell to the best buyers.
Offer free city tours for the masses and in parallel (and during the tour) sell paid private more exclusive (both in content, the number of participants and price) tours.
To educate and attract the next generation of buyers.
Offer online and offline free courses on marketing. These will attract many, some of which will want to hire you to have access to the right answers particular to their situation.
With many museums, what is on display is a fraction of what is in storage.
Build a virtual storage tour of all of the museum’s stored works of art.
If you have a reproduction of a famous painting, why not have it framed like the original?!
Make 3D printed replicas of famous paintings’ frames.