Don't ask customers to pay "a tiny amount". Ask them to pay according to the business value you believe your service provides, scaled to your business objectives (ie: eating, hot showers, customer acquisition).

What Patrick is saying over and over and over and over again is that you have to be willing to let the pathological customers go. One function of your pricing is to chase out the people who aren't driving your business, so you can concentrate on serving the people who derive the maximum value from your work.

Asking for small change is just about the worst thing you can do; pathological customers can afford it, and will immediately feel entitlement.