When I acquired my stash, I guessed at what I might want to make sweaters with and bought 10 skeins. Others I thought might make nice accent yarns and only bought 1 or 2. I wasn't much into socks at the time so mainly purchased in groups of 10. Some of the leftovers from those are now being turned into socks, mittens. gloves for myself or friends. Some of it I still haven't found a project for, but I look at patterns with an eye to what might work with yarn I already have.
"Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it's the only thing that ever has."--Margaret Mead