Why are there no high end cheater plugs?

Yes, I know there are safety reasons for not using such ground lifting devices; but as many audio magazines have suggested, the benefits from lifting all grounds except the preamp are quite substantial. But the 79 cent cheater plug covers much of the improvement. I made some cheater plugs using silver wire but Eagle plugs. They are better than the grey guys. Why does no one make a quality plug? I understand that at one time Siltech did make such a plug.

Please no "educate" me of the safety reasons for not using cheater plugs. I think the success that our immediate ancestors had in surviving two plug ac, suggest that chassis shorts must be quite rare.