My experience was not that niche and unique; I tried to consistently show data around how prices might impact your experience. The amount you charge is not correlated with the majority of the questions I asked sex workers.
All your caveats upfront on the quality of sampling is more than I have seen in many academic papers.
I don't have experience either as service provider or client to give a professionally informed comment here.
However having said that, sex work in general (even only in the United States) starts at lot less than 200-300$/hour in the lower end of the your study[2]. It is a great study and amazing subject testimony but it does only cover mid to high end of the spectrum.
As a basis for policy making covering the lower end of the spectrum and cover specifc policy issues and also cover other stakeholders like healthcare, law enforcement, welfare etc would be important.
I am sure there are lot more qualified people than me you are already in touch/working with, however I am happy to offer my help with statistics or code or lit review and publish formally /research proposal if you wish to go down that route.
[1] Your content, there are some parallels with how startups publish quality industry reports as a brand recognition strategy that I found very interesting.
[2] you have indicated the limitations in many places quite clearly am not finding faulting with your study .
I guess the government's objective is to kill the business completely, which is about as realistic as prohibiting alcohol.
This increases competition of sex workers for johns, artificially drives prices down, gives johns greater bargaining power over sex workers, and doesn’t fix the problem of johns trying hard to remain anonymous and requiring situations where you’re less able to go to the police if you wanted. Sex workers hate this.
I don't have an opinion(or data) on whether this is effective or is good approach or not, just wanted point out that it is less about driving demand down, they are not trying to criminalize johns(it already was) but trying to address issues on the workers side perhaps ineffectively.
The law is supposedly there to protect the sex workers, but you don't do that by forcing into hiding and making it unlikely that any crimes against them will be reported by anyone else.
If they really cared about the sex workers they would instead make it easy for them to get anonymous support with health, in particular mental health, and drug abuse problems. And institute a hotline for sex buyers to call without risk getting into any legal troubles if they suspect that a sex worker needs any help for whatever reason.
It is extremely hard to differentiate who is involuntary legally even if there was strong provisions for it and sex workers mostly can not pay for expensive legal counsel who can make that case.
Nordic laws are an attempt to not decriminalize sex work at the same time not punish the workers at all.
It is not about controlling demand over supply