They can be really bad. Even the cabbies try to sell you stuff. Had one tell me I should go to some massage parlor when I was going to have a nice meal one day. If you look it up on maps the parlor has a menu and they pretty much lay out what you should expect which includes happy evenings...I wasn't interested but this guy kept pushing it. Had one guy another day just randomly tell ne I should buy him a beer. And the Juta system it's state sponsored highway robbery. A route taxi will run you a dollar or two and the Juta wil cost 20 or 30 for basically the same trip. The best place I found to ferry local currency was a bank run atm. Even with fees the rate was better than anything else especially the airport place.