Again, what bussers and hostesses do is not related to check amount. Bartenders, sure. But they probably do the least amount of work per customer and if they are getting a portion of every tip where they make a drink for someone, they should be more than fine anyway.
Bussers definitely get tips. It's usually a percentage of your sales, the same goes for food runners and barbacks.
At its core, tipping based on check amount is stupid and makes people feel like they deserve more money just because someone ordered the lobster or the sea bass when they didn’t do anything extra.
If tipping were done away with an equivalent service charge based on food cost would be implemented instead. Think autograt.