Is there salary category for sponsoring visisting visa?

Some residents of neighbouring countries can get visa on arrival in Qatar if they have a GCC resident's visa. Whether they can get this depends on the designation of the visa. Those designated as CEO's. engineers, business owners and so on will be able to get visas, while those designated as labourers or students will not be able to get visas. The visa must be valid for six months after the date of arrival in Qatar, and is usually valid for thirty days. As always, confirm with your airline whether you are valid for the visa before you pay for your airline ticket.

Link: http://www.qatarvisitor.com/index.php?cID=413&pID=978

I think Minimum salary requirement is 4000.00 qrs

and

1) NOC from Sponsor

2) Salary Cerificate

3) Copy of Marriage Certificate