Re: why does Tom Anderson?
My USA Schecter Tele is a derivitive of a Tom Anderson, since Tom used to work for Schecter. It's got 2 strap buttons on the end, too. Kind of a pain when I went to buy straplocks, since I had to have 3 buttons!
Here's the other useful feature of having two strap buttons. You can have two different heights for your guitar. If you use the top one normally, then want to choke up on the strap a bit, you just switch to the lower one. This is good for studio work when you're constantly sitting and standing. On the lower one, your strap won't keep sliding off your shoulder if you sit down.