I imagine the Parisians know the tourists will pay a lot for just about anything and they take advantage of that. Maybe in Rome they retained some pride in their work, or they are not as avaricious. Another thing I see in Paris is a fair number of American chain places, McDs, Starbucks, Pizza Hut, KFC, , Burger King, etc. That is a bit depressing. The wife tells me her kids loved to go to "McDoo" back in the day. They also serve a LOT of Coke, even more now that the blood alcohol limits was lowered.
The Parisians I know dislike tourists, they might like their money, but there is a definite attitude about tourists you don't find in other French cities. But the times I've been on my own and gone into a bar or bistro away from the tourist areas I have been treated very well. I try and speak French and they help me rather than just going to English to cut to the chase.
The wife claims I have a very good accent but I know that isn't really true.
She's been talking about how she wants to go back of late. I say maybe October, maybe.