What's the difference??? It all works out the same in the end, you need to charge so much per print to pay for the ORC.... that's a "click" charge. If you are concerned with quality you will be changing your ORC's just as often as if you had metered service plans, if not you may stretch them out a little longer. Or you may find that an ORC fails faster than normal and you are spending the $'s for the part sooner than you planned. But with the metered service plan I may change my ORC'c a little faster to keep my print quality up without concern for the cost.
I think in the end it's a wash, I know that I have $5,000 in toner on my shelf (4 each color) $200 in fuser oil, $480 in developer, not to mention charge corotrons and waste toner bottles, 2nd BTB's and such, which I didn't have to present AR with a invoice. Plus I don't have to stretch things out to keep the machine operating if cash flow slows. But I am also presenting myself with the opportunity to be paying for stuff I may not be using.... so flip a coin, but for me it's easier to pay $.049 chunks then to pay hundreds or thousands of dollars for parts.