Why are nice jeans so hard to find?

When I like a pair of jeans they are with me for years, because to be honest I rarely find a pair that fit nicely so I tend to wear mine til thay fall off! Imagine my delight when I went to my new local River Island to find a great selection of jeans with a great size range...and they actually fit nicely. You have to try their Longer legs jeans they are great ( I have had trouble with too low a jean in the past exposing a bit too much!These were just right) oh and by the way by longer legs, I don't mean for tall people, that's what they're called. They're not on the website at the moment, but if you go in-store then look out for the silver label on the inside.