Eventually they'll get the point. It's all part of the game they've mastered over centuries of souk life. You can't possibly outfox them. The good news is that Moroccan transport can be inexpensive, unless you rent a four wheel drive. The bad news is you may have to bargain with taxis.
Prices can be high.
OK, it was literally the last car in Ouarzazate on a weekend, but this is a typical gouge. And since they charge per passenger, you must either wait for other passengers to show up or pay for empty seats. Again you must bargain to get a fair price. That is unlike the petit taxis which roam only up to a city's limits. See our story, the bus from hell .