They could make the permits free to people that do less than $N in revenue, which would still leave them with the ability to revoke permits from people who abuse them.
There are always two ways in such situations - make perfect law or apply imperfect law selectively. If you ask me, I prefer perfect law (but I am biased because I'm in Russia and I often see how selective application may be terribly abused). On the other side, it is not always feasible or possible to design perfect law. But in this particular situation IMHO it is definitely the better option.
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They could make the permits free to people that do less than $N in revenue, which would still leave them with the ability to revoke permits from people who abuse them.
There are always two ways in such situations - make perfect law or apply imperfect law selectively. If you ask me, I prefer perfect law (but I am biased because I'm in Russia and I often see how selective application may be terribly abused). On the other side, it is not always feasible or possible to design perfect law. But in this particular situation IMHO it is definitely the better option.