As Andy stated, $1 per commercial custy is a small sum, to be used for the benefit of all river users.
However, there are many thousands of examples throughout the country, of public resources in which the creation of even the smallest fee-based administrative/regulatory structure has devolved into a much more restrictive environment which fuels the beauracratic "vicious cycle".
Inevitably, the initial fee is used for some "public amenity", and the development of more amenities and upgrades is proposed (to justify the existence and growth of the administrative agency). The agency uses the precedent of existing user-fees as justification of additional fees to finance new programs. This cycle continues, followed shortly by more formal permitting, additional enforcement/rangers, etc, which require additional funding through user-fees.
This can truly be a slippery slope. I have indeed seen it many times.
Maybe this case is different.