The point is that you're supposed to be in jail to "sit and think" about what you did wrong. Bail costs would eliminate that. Now, what price do you think the GMs must make you pay such that you will not have to sit through it?
With that in mind, I really don't think it should be as low as 7m, which is your high point, Ruon. If anything, this price should be set such that it's high enough for you to say, "aw shit, i'm never breaking this rule again." At 5m? No chance. Try 50m, then you /might/ think twice.
