Because Irbid is not an industrial or a rich city many of its residents seek a better life in the oil rich Gulf countries like Kuwait and Saudi ِArabia. I am not sure of the number of Jordanians working in the Gulf countries but I would say no less than couple of millions. Taking into account that the population of Jordan is six millions only. In the first Gulf War 500,000 Jordanians were forced to return back from Kuwait.
Jordanian expatriates in the Gulf send money to help their parents and siblings in Jordan. They also send money to build new beautiful houses (pictures to come soon). The pictures below are taken at a poor neighborhood yet you can see the expensive convertible Z4 BMW parking near a very bumble house.