The thing that seems really wierd to me are the space station, base and satelite contracts, since you dont actually need them to stay there.
I have exploited this many times. Having a lander that has enough crew members, solar panels and a docking port, puting it into orbit, wait for the contract to fininsh, then do the landing and head home.
The station/base should be, when all requirements are met, "given" to the contract company for some time or forever. The vessel is still trackable, but no longer controlable.
What do you think?