Why knit socks when you can buy them cheaply?
Because it's a great feeling to wear them on your feet as you go through your day. Kind of like when you're wearing delicate, hand-washables under your everyday clothes.
These are the second pair that I've knit for myself. On the first pair (details to come), I made one too long and have to rip it out. On this one, the one on the left is a bit long, but I'm not ripping out because they were a toe-up construction. Details at Ravelry.