Whatever you may think of the idea, the fact remains that Tom has explicitly stated his opposition to mercenary nobles, especially under SMA.
So the burden of proof is on Lorgan to show that it should be allowed, and Tom is the one you need to convince.
I remember that Tom has stated his opposition to mercenary as a new class, and also to making in any way easier to play the game as a rogue. None of this is asked here however. Fighting for money is extremely common, this is just calling it by its name.
