I think a combination of your level and your army of some sort would be good. This way it's how strong, (i.e. how high up your level and also how big and powerful is your army), you are that dictates the bounty. In the real world, if you're going to hit someone strong, you are going to want a big bounty. If you're going to kick around pre-schoolers for lollipops, you're going to get chump change...
Income is a poor determining factor for bounty price. It limits our sanctions and encourages people to use auto-clickers to collect, (which puts the rest of us that just log on normally), at a distinct disadvantage.
Mach
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