Why are muslims so sneaky in business deals?

i've noticed this alot. I went to a jewler once and was looking for a ring. On the cabinet it said 18 carrot, but when i took a closer look it was a 9 carrot ring. I just walked out. Another time was looking for a gold braclet this time they said it was pure gold and selling it for AU$280, I later found out it was copper in lay, felt like a real stooge. Just everything they do is dodgy, and they get aggressive if **** doesn't go their way. This happens to alot of stooges as well, from now on i'm very careful what they say and do. Good point is the ability to bargain with them, but their dodge ways put it off, and make the situation ugly.