Quote - It only has a limited amount of ovens it can cook up experiments with...    It can scoop just so many times and do tests...  yes, million$  but I personally think it is worth the money to know what we learned so far... 

I didnt mean to imply its worth.. but rather couldnt they continue to use the lander for taking a site seeing tour and take as many photos as they can till the thing dies on them.  Rather than end the mission because the ovens are done.