Ad-free tier would be an appealing option - I often find the ads on this site to include cleavage-filled shots for random mobile games. Without a smart phone these ads are useless to me but the artwork they often use makes looking at the site at work or even around my kids embarrassing.
I'm not really a fan of limiting content to supporters, as making sure the site is appealing to everyone seems like an important way to grow content and user-base. Time delays are ok, I guess.
It's a shame that Broodwars doesn't consider the site worth supporting at all, but everyone has to make their own choices about where to spend their limited resources. I do appreciate the wide variance in support levels offered. Committing to a $12 or $24 donation over the course of a year shouldn't be hard for most. If this site is something you use and get regular enjoyment from, that's not a high threshold. I was able to go a bit higher because we are in a good place financially (and let's face it: as a Nintendo gamer I'm not spending much money on games these days).