Distressed jeans, like any trend, come and go. Right now, they are decidedly in. But by the time you can wear in a pair of jeans to the point they’re appropriately torn up, the trend will probably have passed.
If you want to capitalize on the ripped jeans look, buy a pair with the knees blown out, in a light wash, but don’t break the bank. For your trend-defying slim cut, dark wash pair, avoid any major rips or tears, but keep getting the crotch patched up until your tailor says it’s a lost cause.