we believe at least a few of those most interested in providing donations are the kind who don't want anything "useful" for it. Some don't even want to be recognized for it,
@Mahz. For them, the community and site thriving is reward enough.
We think the best sort of "reward" would be on the level of a trophy. Having functions/features only available to those who donate risks ending up in creating a community that excludes those who cannot afford to donate. Of those able to donate at all, some might also only be able to donate on a highly irregular basis, which would kinda ruin the effect of temporarily granted privileges for those.
In our entirely personal opinion, rather than the impersonal one above, we don't like the idea of the "full experience" of the guild not being free people of all levels of personal economy. Where "regular" computer games, especially the more advanced ones, cost money to buy, the act of writing stories (alone or with others) doesn't. That is one of the best features roleplaying has when put up against graphic games. In principle you can roleplay just as well on a 15-20-year old computer as you can on a €200,000 gaming rig. Same goes with internet connections. Fast or slow, plain text the way PBP RPs are based upon, the load time is never all that great.