Drag Slick Tubes.....whats the life spand???

I don't run tubes...its just added weight, AND if you get a hole in your slick you can't plug it at the track if you're running tubes. For example: I just watched a friend of mine miss out on going to the division finals because of a tube....his tire went down just before time trials at the last points race, he quickly found the leak, prepped the tire, shoved a plug in it, but because the valve stem was not designed to hold air (because it was made for a tube), all the air leaked out around the stem and it went flat again. He pulled the wheel and ran it to a tire shop down the road, missed his time runs, got it fixed, got back right as round 1 was starting, just guessed at the dial and lost. All he needed was 1 rd win I think and he would have made it...#-o Needles to say, he said he will be removing the tubes from now on.