/me steps into the ring and stretches his arms out, holding smooth and pigglet back from one another
Let's try to get things back on track here guys, no need to get hostile
ng has summed things up pretty well. The most one can really ask for is a general monthly cost, in which case that's something that is already occasionally mentioned.
Why don't we have a meter? Because Hal doesn't prefer to do things that way. Meters come across as constantly asking for donations, and no one likes to be constantly reminded to "please donate!" through some meter. Instead, Hal lets people donate as they see fit, when they see fit, and only outright asks for money when the circumstances require it.