Milky, where did you see me saying it's not happening? I am the one who is aware of it more than anyone else! And I am the one who is fighting this "gray market" for the last 2-3 years. I never said it's not happening.
Neither I ever said that looking for the job by itself is illegal. Anyone is free to look for better (or any) job at any point of the globe and at any moment of their life. Regardless to the type of the visa (if ANY) they hold. What I am saying is it's illegal to purchase a business visa.

As for the explanation of the immigration stuff:
So here is the scenario. One comes on a Visit or Business visa irrespect on what ever their motives are. They apply to companies, get an interview, get a job offer and a proper Visa is then issued. They will flyout of Qatar and then come back on proper visa. But in Visit Visa case you dont need to leave the country you can just pay QR500 and the visa will be transfered.
I am really sorry darling, but the entire above statement is wrong.
First, what is "Visit visa"? ANY visa issued by Qatar government is a VISIT type of visa, including a Work visa. It's done to let us feel that we ALL are VISITORS here.
Second, what is "Proper visa"? Any type of visa, issued by the Government is a proper visa. The problem is whether this "proper" visa was obtained legally or not.
Third, they not necessary have to fly out of Qatar. It depends on many factors, starting from what type of visa is issued by the hiring company. If Work visa is issued, ANY type of other visa can be switched to Work visa without leaving Qatar.