For those of you that track your cost per wear, what kind of number do you consider to be good? I've been reading about it a bit, and while I'm not sure if its something I'm really interested in tracking, I sort of got to thinking about some items I have and doing the rough calculations. So what are you shooting for here? $1, $5, $10 or pennies? Do you have a number in mind that you have to hit before you make a pricey purchase?