Looks like I'm still a supporter from the last time I paid.
I guess I'll just need to re-up whenever I'm due.
On all of the other forums I'm a supporting member there is some sort of incentive to donate. While that incentive wasn't really needed in this case (the fact that CD can continue to exist is good enough for me) it may be needed for some other members. Other forums I'm on have done things like allowing larger signatures than normal, custom user titles (which are editable by all on here), different color names to differentiate between supporting members and regular members, small badges saying supporting member, larger PM box etc. I'm sure some of these could be implemented here without much fuss, should someone want to pursue them.