Server rules, and RP rules, and they all have consequences.
This isn't a server rule, it's an RP rule.
You don't get banned for not RPing with it, or refusing, you just face the consequences.
As for the other mercs, I do ask them to leave, you won't believe how many times I go to private to avoid the screams of Liberty Fascists
So, uh... this is an RP regulations question:
As a Junker, I have a leg-breaking thug character that hates mercs. This means I can antagonize and harass them (subtly) without worrying about reprecussions from the local house security? I use this loophole to exact tolls from non-affiliated smugglers already, and it's been getting an amusing 'impasse' reaction.