But we probably already have paid editors, aside from the Microsoft guy. The issue is whether they conform to our standards, and not those of some other entity. Purely biased editing is easy to spot. Edits which aren't purely biased are... well... neutral.
I should add that certain policies like the almost defuct WP:RS, (now WP:RSWP) are laced with subjectives ("reliablility") and don't make it any easier for us to tell the difference between someone removing something for a legitimate reason (like outlandish uncorroborated claims) and illegitimate reasons (like misapplying BLP standards to regular articles) .
-Stevertigo