We need more information before we can give you a straight answer. For example, if the reason they're costing you more than you make is because they're using s

We need more information before we can give you a straight answer. For example, if the reason they're costing you more than you make is because they're using some resource you offered them, and you cut them, you're going to have a social problem on your hands. On the other hand, if it's because you offer a service for like 15 minutes a month and they're leaving it on 24/7, you can probably get away with metering. Tell us more.