I'll use the High Casual tag on a RP interest check as a means of trying to attract the larger block of Casual roleplayers to a (mostly) Advanced game.

In part to draw on the larger Casual numbers, but mostly because in the past I've had success finding Casual RPers that could (and in my opinion should) jump into some Advanced games by using the High Casual tag. Some never grow comfortable in the Advanced games, some do, I can't recall one ever strictly doing Advanced games after though. 

I think I just called High Casual a 'gateway drug', but whatever. ^_^