The sponsorship is almost like a contract...I know, as a UTC employee, we had a sponsorhip of the living seas for 10 years at a cost of $10M a year. In return we employees had a backstage area, (lounge) where we could get free snacks and drinks. The company also gets an area of free advertisement such as the hydrolators (Otis elevators to nowhere) and some products shown in the preshow, (if my memory serves me correctly). Too bad the company doesn't want to sponsor anything now...darn shareholders don't want to give up $10M pofit a year.
Now as an Otis employee...I've gotten to go behind the scenes of the Tower of Terror, since the WDW, DL, and DLP versions are all Otis elevator products, (though you will never see the word Otis anywhere on the ride, no one wants to remember Otis that way), and Otis services the ride along with all other elevators and escalators on WDW property. We still have the occasional visit from the Imagineers when they are looking for upgrades to the ride in CT where Otis Engineering is located.