There seems to be a popular fallacy, mostly in the minds on non TM'ers that TM's are expensive to maintain. Nothing could be further from the truth, in my experience. Yes, the parts can be expensive but modern machines are so durable and reliable that most of the major components run perfectly for 1,000's of hours. And when you consider the sheer revenue earning potential of a TM, the odd part here and there is a drop in the ocean.
Simon