I'm willing to pay for a couple of reasons. 13 bucks isn't really alot of money....1 less lunch out every week and I could save more then enough to cover that, maybe even eat a little better too.
Also, as a bunch of us in LoS learned when we ran a BF1942 server, it's a pain in the ass. It's worth it to me to have someone else police the server, and keep out the cheats and griefers. 50 cents a day for less stress when I'm playing? Sign me up.