Of course it does. If the Tonys did not promote all the celebrities that would be on the telecast, there would definitely be a drop in ratings. Plus, promoting that celebrities have an interest in the theater has the potential to introduce Broadway to an audience who would otherwise not tune in.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle