Well then, AwesomeDanny, you haven't heard of over a dozen titles that were filmed and are on DVD:
KISS ME KATE
COMPANY
INTO THE WOODS
SUNDAY IN THE PARK WITH GEORGE
PETER PAN
PUTTING IT TOGETHER
SWEENEY TODD
RENT
CATS
VICTOR/VICTORIA
CINDERELLA
PASSION
JOSEPH AND THE AMAZING TECHNICOLOR DREAMCOAT
FOSSE
SMOKEY JOE'S CAFE
and this doesn't even include studio-filmed productions, such as JESUS CHRIST SUPERSTAR or DOZENS of plays such as THE MAN WHO CAME TO DINNER!
"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