Because most don't think it WILL do well. It's one thing to sell out an off b'way, 200 seat theater in a limited run, but can it even come close in a 1,000 seat house with a ticket costing 2x as much to?
Might it move? Sure. MIght is succeed? Sure. Few thought Rock of Ages would succeed or Next to Normal. But truth be told few do, like Title of Show, Bloody, Bloody Andrew Jackson, And things with a big following that never even made the jump: Bare springs to mind.
And as Kad said, it's not being taken seriously by the biz. It's audience is far too narrow.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.