We are currently only using about 1/4 of the resources, so people could trim the cost further (although being over specced helps a lot when there are spikes in activity and it will mean we don’t have to upgrade any time soon).
Our hosting costs are more that fully covered by around 20 people donating and that should scale with growth (although possibly not in a truly linear way). We also have a decent “warchest” which should see us through most temporary problems.
One reason we break the finances down is because we are a medium-sized instance and we want to demonstrate that it is perfectly possible to run one supported by donations.
If anyone has any questions they are welcome to message me or they can drop it into the monthly financial report (the new one will be next week).