Very nice and extensive guide.
I decided to give you some extra crowns,
and I figure appending an example may help:

This +100 contribution was given using RP that will now begin to regenerate over time, simply from having Crowns. The contribution given can equal various amounts of rubies depending on landmark level. Each landmark is worth 20/25/30/35/40 rubies depending on tier, so the RP generated by Crowns generally has more impact on real contributors rather than people trading RP 5 at a time or something similar. An exception here would be that giving some new player 20 contribution may have a significant impact on their collection compared to someone else. However it is important to note: the higher your contribution, the more the next 20 is worth, and if you are using crowns for their intended purpose of rewarding others, it is likely that will circle back around to you in the end, in one way or another.