The 260,000 came from a poll in the first forum post: An Idea For Team Taxonomy aka WTF is a Guild?
The 13,000 BANK came from this forum post, and yes I think every guild should have a Notion admin: Decentralization of Notion Permissions Proposal
The 10,000 BANK number was explored in a few forum posts, and you can see some calculations on the impact in the comments here: An Idea For Team Taxonomy aka WTF is a Guild? - #7 by links
Thanks for your feedback!