They will not let you walk away. Be reasonable they have to make a living ,too. There are great jewelers and perfumeries in Cairo. And Aswan has the most wonderful spices in the world. And if they do there is no toilet paper - so bring your own and be prepared.
FOOD ONLY eat in a five star hotel.
And even then be careful of your choices. Stay away from the meat except at the Sonesta in Luxor. I toured that kitchen and it was wonderful. But that is the ONLY place I would ever eat meat. I didn't even eat it there because who knows where the meat had been before it got to the Sonesta.