The Moroccan currency is worth very little compared to American dollars, and poverty and unemployment are at very high rates there. When they see six young backpackers, they naturally see opportunity. The entire time we were in Morocco, we couldn't shake the people. In return, a little tip is always expected. Trouble is, you never know who is honestly wanting to help you and who might lead you down a dark alley.
Every price is negotiable.
The listed price is usually twice what you eventually wind up paying. If you look wealthy, the shop owner doesn't bring the price down. If you look less rich, you can haggle. Marrakesh was alive with water sellers, snake charmers, buzzing mopeds, fresh orange juice sellers. Lots of smiling people, everyone wanting to get a piece of the Americans wallets.