Wow and I thought realtors getting a % cut on sales was a scam, at least in NA when you get to the notary, it's a flat fee.
Pharmacies in Italy work much like notaries, although they obviously provide a much more useful service. My understanding is that in part of the US taxis work the same way, with limited # of "medallions" being treated as an investment.
In California (I think other states, but each state has it's own specific laws) the fees are fixed below a small set amount.
https://www.nationalnotary.org/knowledge-center/about-notari...