Being the tire guru I´ve become here´s what I can tell you.
The second most common cause of "irregular" tire wear is loose or worn suspension components. I´ve found in the scort for the front tires its tierod ends and for my rears (the outsides are toasted) its from hitting intersection left and ride hand turns like I´m on the autoX course
The most common cause of premature tire wear (irregular and regular) is air pressure. You should honestly check your air pressure like once a week.
I guess the third is just bad tires.
Anyhow, how hard you push your tires will just aid anything that will cause bad wear. Do realize that I´m not a know-it-all...I just talk from experience. Besides working at a Sears, I get about 8 months out of a set of Kumho´s. I push hard into turns and run my tires just hard in general. I also have a bad left front tierod end and need an alignment badly because of it.
If the tire isn´t feathered, just worn in one place or another, the problem could be soley alignment. So if your insides are torn up, its probably camber and toe. If its the outsides its more then likely toe and caster.