Seems to me like alot of inspectors will pass anything that has a "caddy" type clip or hanger, but will find all sorts of problems with anything not out of a package or box. Tie wire for conduit securing in metal stud horizontal runs comes to mind. If I put a "caddy" securing clip on -no problems. If I tie wire the thing to the stud - problem. The plumber's tape shown in the picture is crummy, but it is just as good or better than the accepted practice of using an "identified" grid ceiling wire as a hanger with a k-16 clip on it. Since we have a wood ceiling in this picture what about if the installer had of secured a verticle 2" x 6" down from the joist, drilled a hole in it, and ran his pipe through it. Would this have caused a problem for anyone?.
