The only benefit is to recover maximum data from it.
It is a very large replacement cost, so the lowest risk/highest return strategy is to conserve it.
The operating cost is high, but every bit of data recovered from it is precious, so few are going to whine much if it extend spast 90 days useful life.
If you look at the concept of relatively large scale expeditions of
MER vX.0, then the cost of operatin each one drops as a larger pool of qualified operators of the craft is developed, and multiple probes are sent via single launches.
Andthe spin-off factor of advanced robotic and remote tech, along with a strong rocket launch/satellite mgt. industry would be tremendous, imho.
Ed