Mr Angry Varied use of the stadium also raises the profile of the club and our town and that leads to increased investment from other organisations.
Nail hit squarely on the head there - any extra revenue and publicity that can be gleaned from "renting out" the stadium is a bonus. In the past few years there's been:
England 'B' International
England U21 Internationals
Elton John Concert
Red Hot Chilli Peppers Concert
That radio thingy (XS?)
Add to that the cancellation of Pavarotti's concert and the fact that the half-marathon finishes there and it goes to shows the amount of interest in using the Mad Stad as a venue.
Plus, as far as I can remember, this was the first game to be called off due to a waterlogged pitch so its not like the rugby causes persistent problems.