They honestly shouldn't even be on the server. You could make them $300k each and people would still buy them because its easier then gun play. RPGs stop what would otherwise be absolutely awesome engagements in just a few seconds. Then the fight is over, armor is blown up, everyones dead and what, they get to sit up there on the tower and be like, "yea suck my 60k faggots!" or whatever.
What's the point of even having armored vehicles if you only need to spend barely twice the cost of the vehicle itself to blow it up entirely with everyone in it?
Just my opinion