I have to agree with eest and ...I don't know who these people are anymore. Anyway, if you're making the sigs and you notice the same people making requests frequently, the simple solution is to not make them sigs if you don't want to.
We don't take sig rights away on a whim. They're all on a case by case basis and making a sig that is over the limits is not against the rules. Using it is though and as someone here has said, that is the responsibility of the account holder to make sure that it is within the limits.
