Some thoughts... I'd suggest adding a banner to the main site and perhaps also the forum asking for donations or subscriptions; I checked while logged out and there's currently nothing obvious on the site mentioning their importance. Other sites that are dependent on donations do this sort of thing, and without it, people may not be aware of the importance of such contributions.
Adding additional subscription rates for people who want to help out more might also be a good idea. I for one would be willing to do more than $2 a week to help take the edge off the hosting costs a bit more. (Alternatively, I could submit a periodic donation on top of my existing subscription; but just increasing the subscription rate would of course be easier.) Unless I've missed something, I don't see where I can increase my subscription rate in PayPal, nor do I recall such an option when subscribing.
And one would think there are reputable choices among the alternatives to Google AdSense for embedded advertising, though I'm afraid I don't have the experience in this area to give recommendations.
It's nice to see "credits and such" from Wikipedia not only discouraged but explicitly "not allowed"; now, can the same be said for information from IMDb, BCDB, and other sources of dubious reliability, and "open season" declared for cleansing the database of such information? One of the raisons d'être for this site in the first place, as I understand it, was to create a resource with greater reliability than the other databases -- hence features like restricting contributory access to the database to authorized "researchers", and displaying the sources for listed credits (something I'd like to see expanded to things like release dates and character voice credits, by the way). For this site to stand out as superior, it needs to hold fast to that goal, and permitting information that's simply copied over from the other databases or other low quality sources undermines it.