It is about control. But, control of a type. Ownership.  In the days of old you buy a thing it is yours. Often you have a title and get the privilege of paying taxes on it proving and sometimes painfully so, that it is yours.

Not so Job's stuff. When you buy his, I'm thinking in his mind it is still his stuff. His system, right?  The thing in your hand or on your desk is nothing more than a part of his system. Emphasis "his."

You pay him for the privilege.

He may not be Lord Chamberlain but he does seem to fancy himself the Lord of the Manner. Master of all he surveys.