While one of them is busy trying to sell you stolen goods out of the back of his van, the others will have snuck in the back and be stealing your own stuff to sell 100 yards down the road.
Like to think that there way of life is the best, probably the main reason they like to travel around is to make it more difficult for the law to catch up with them.
Worst thing about them is, that the police can never do anything and if your stupid enough to stick up for yourself and your property then they will come back 100 times worse with even more of their scummy family.
There are two types of Gypsies out there, there are the ones who still live by their traditions (speak the Rom language, don't date outside their race, work as psychics, etc) and there are the ones like me who live just like everyday people work 9-5, go to church, school, etc.
Most have stopped travelling nowadays, but there are still some who refuse to settle down, and festivals at certain times of the year celebrating the culture.