Maybe it's time to think of some additional perks and benefits for Patronage, much like the layered tiers of bonus swag that people can get from donating to Kickstarters or Patreons.
For example, the Fandible gamers record two types of podcasts: they have their regular weekly actual play episodes, and in addition to that, they have the Geeky Topics, Round Table podcast. GTRT is a panel discussion, where the players sit around and talk about pretty much anything. One of the benefits they offer to their Patreon supporters (which, in Fandible parlance, are also known as "pervy kobolds", because of ...reasons), is that the people who've subscribed to the Patreon can send the gaming group questions that they'd like to have answered. These questions are then brought up during the podcast, and discussed at length.
If you ever get around to resurrecting Geek-A-Saurus (and with the number of other site contributors available for online discussions via Skype and G+ Hangouts, it should be fairly easy to gather up a regular group of GMs and players for such debates), you could consider doing the same. Of course, people already have the opportunity to ask the contributors questions through the forums, but having the topics discussed on a podcast seems special, somehow.
Of course, another podcast industry standard bonus is the whole "if you donate, you get to listen to the episodes a couple of days early, and gain access to super-secret bonus episodes", which has already been tested here on RPGMP3 for years.
EDIT: After browsing the interwebs to see what incentives other gaming groups offer their Patreon subscribers, here are some suggestions that might work as new bonus features for Patrons. (Some of them probably wouldn't work with the way the site is designed, and some of them require a bit of extra work, but at least a few of them show decent potential.)
- Patr(e)on exclusives: gain access to raw recordings, lost episodes, out-takes, live-stream videos, early releases.
- Get access to updated character sheets and in-game notes after each session.
- Free merchandise, e.g. t-shirts.
- Get mentioned on a "Patr(e)on supporter page" - possibly being allowed to post a link to your own website.
- Patr(e)on supporters get mentioned on the podcast.
- Be able to advertise on the site for free.
- Get to name/create an NPC.
- Get the opportunity to corroborate with the players on creating PCs (bare-bones ideas or fully-fledged characters).
- Suggest topics for a Geek-A-Saurus-style discussion podcast.
- Live access to the gaming sessions via roll20.net, so you can provide commentary on the action.
- Get to spend, say, 30 minutes per recording session just talking to Hal & Co.
- Be invited to participate in an actual game, either a one-shot game, or as a minor single-shot character in an ongoing campaign.