I like donations.

I think it makes the game more interesting. It is a concrete way to measure your contribution, with in game and noticeable rewards for outstanding participation. I would imagine that every cabal would want something like donations, especially once the Empire grows. I also do not think 100 gold is a great sum to ask, given how much is expected. In fact, if you spend a long time lingering c.100 gold as an Oath, I would imagine you'd find yourself Anathema.