.28 cents... about as much as I'd pay for a pegusus or the Man/Bear/Pig. I have never understood the need for eveything IS... like the masses begging for the 135 w/IS. It won't save poor technique or much beyond still work. I love the ability of it on a tele... like the 70-200 but honestly it is off 95% of the time on mine.
Again... For video IS is a massive +
Remember that the general rule for getting sharp images is focal length/shutter speed = <1
And that for video you are stuck at a shutter sped of 1/50th second if you want natural looking motion at 24/25 frames per second.
For the 135 that means you're very unlikely to get usable hand-held footage (unless you only need a very brief cutaway).
With a 4-stop IS system, you would be able to shoot reasonable hand-held video with a 135mm lens. Consequently for video shooters this would be a killer feature. It has nothing to do with poor technique (unless you count not having every shot locked off on a tripod/dolly/crane as poor technique I guess - but this is hardly feasible for low-budget event/documentary jobs). Much the same can be said about shooting handheld at 70mm - you might get away with it as it's closer to a 1:1 focal length to shutter speed ration - but IS will give you a steadier shot on a more consistent basis.
IS may not be what you look for or need for your own particular usage, however for others (particularly those focussed on video, or who make significant usage of video) IS is a massive advantage in a lens.