I'm by no means an expert, but I'd assume that for speed bumps to wear your tires so much you'd have to drive over them quite often; as in every day, back and forth from work, no? Besides, wouldn't the front tires be as worn as the rear tires?
Lucky for us we don't have these around here. We only have the normal road wide ones. Only thing is that they seem to be getting steeper and ''squarisher'' with time.
I'm really unsure about those things. The street in front of my house is a stretch of road maybe 600m long. On this, there's a single speed bump, not in the middle by any means. The thing about speed bumps is that they piss off people, and I'd say that once they go over them, some probably hammer down the pedal to make up for the lost time, which defeats the point of slowing down anybody in the first place.
Still is an interesting fact that they are still the best way to actually stop people. Most drivers only slow down at stop signs, but the fear of material damage is enough to slow them down probably even more with speed bumps. Wouldn't it be logical to put them at every stop sign?