Yes, certainly often Courtiers have a unit but it's small, nothing compared to those you need as a Warrior during a war.
I played lot of time as a Courtier and often you can do you job unitless without problem.
OK, I guess the points I want to make are more general.
The first is that you can't pigeonhole player actions. I play an infiltrator who carries large units. Why? Because I can, and it's none of your business; I also played a unitless warrior at some point.
The second is that what you think other people need as gold is only mildly related to what they should receive. If you, as a Lord, want to give smaller tax share to courtiers, that's fine, but don't expect to have swarm of courtiers come and take care of your region afterwards. Same goes for priests and infils. If you want one as a knight, give him a good enough share that he will accept to do your bidding, and that's it.
That being said, I don't actually think that having "courtier bounty pots" is such a great idea. I just disagree with your argument that "courtier don't need gold because they don't need troops". This thinking leads to other idea, such as limiting tax share for priests, that I think goes against the spirit of the game.
