I thought the nature of RB is to get you as much choice as possible, at the best price. I suppose if you are regularly running RB then it would be annoying to constantly getting cut/paste bids from wgs that don't fit the criteria but it is simple to remove them.
I have only run a couple of RBs, both unsuccessfully so I don't have much faith in them anyway. Others will have better experiences.
Giving wgs the opportunity to make a connection between my AW & UKP profiles ain't happening, so I'm "out".