If one goes to Vegas to hobby, prices will be high, whereas in Montreal they will be low. I doubt service levels will be all that different.
Price has little to do with service levels from my experience. IMHO in the GTA an SP charging $400 per hour is not usually 'better' than one charging $250. per hour. It really just boils down to A) do you as a hobbyist find the SP hot? & B) do you click with her after meeting? If you find her hot and the two of you click, you will have a great time whether she charges $125 or $400.
Finding an SP you think is hot is fairly easy in this day and age as pics are up online so you can look over the pics to find your type. So if not B&S, the hotness factor is solved for you before the meet. The clicking is the hard part - you can read reviews to help, but just because hobbyist A clicked with SP X and had a great session doesn't mean you will - the infamous YMMV. Also, you might have a great session with and SP and the nest guy might find she is a cold fish. Sex is about chemistry to a degree, even in the biz.
I have a certain hit/miss ratio with clicking with SP's. I've seen $400, $300, $250, $200 per hour SPs over the years. I have found no higher percentage of 'clicking' with $400 SP's over $250 SP's. Some SP's you get along like a house on fire with, and others times you feel like Bogart at a feminist authors convention lol.
I had a great outcall for $300 last night at my house with a regular of mine. She'd be the same girl if she charged $200 or $500. Market demand pricing doesn't make for more or less service. When you click with an SP, put her on your repeat list. I do.
As for porn vs SP pricing, I recall most porn is filmed in the LA area. It is not illegal in the U.S. to be a porn star and make porn movies. It is illegal to be an SP in the U.S. and see clients. A promoter can put up posters at UCLA requesting girls call him to audition for a role in a porn movie and work for him. If he put up a poster at UCLA asking for girls to call him to work for him as SP's seeing clients it would be LAPD calling him lol. Also, as said, it is less risky being in a movie as you are with a group of profressionals on a closed set. Therefore, I can see non-famous porn actresses getting paid less per hour than upscale SP's in LA.