At Hotels Online we believe in the principle that you pay by results, in our case that is: using our PMS. We bill monthly on an after-the-fact basis, looking at the number of occupied rooms in that period. After all, an occupied room has led to revenue and thus brought money into the bank. Thus, we make costs variable just like your business.
If you have had low occupancy, then the cost for that month will be a little lower than in months when occupancy is high, for example, in high season. And are you closed for several weeks or months? Then the counter stands still for a while. Now that really is No Cure No Pay!