I don't think some of you understand what that "prick button pusher" understand the full deal so I am gonna explain how it works on the other side of the counter from at least the company I work for. Gate agents get their numbers that determine weight restrictions from the flight release sent by the dispatchers. I think we can all agree that those numbers are not accurate. Not to mention if the flight takes a csa(in this situation, gate delay) delay, the "8 dollar and hour" gate agents may get a write up. With enough of them, a termination is possible. And pilots are not exactly forgiving when it comes to delays on csa. Now, if paying passengers/bags, mail or freight is being bumped, it will be hard to explain the jumpseater being able to ride in the close out reports. I understand that there are some power tripping agents out there as I've crossed paths with some of them(esp the more senior ones) but more often it is probably the case of the agent just trying to do their jobs. It would probably play in your favor if you guys can some how get in touch with the crew early(before they start fueling/boarding) or contact dispatch(for your own respective company) so that it is planned from early on .
The -200 is a whole lot easier to accommodate a jumpseat than the -135/45. But i've seen crazy things happen. For what it's worth, I actually reprimand my agents for not being accommodating to nonrevs/jumpseats. Please remember that when I need a lift.