Right now clan treasuries do not provide any meaningful purpose other than being a requirement to have a clan And to curtail the number of bots a clan can hold.
Some suggested changes to make it more engaging:
Allow repairs for gear to be paid by the treasury as a rank toggle option for leaders to play with.
Allow signups for tournament bots to be pulled from a clans treasury.
Allow withdrawals from the treasury that can be capped and toggled by leadership for members to buy gear for their bots.
Make accepting new bots to the clan cost treasury upfront scaling based on number of clan members(the daily treasury amount is a good starting point to curtail clan member numbers)
These changes would give high level players more of a sense of contribution to their clan as well as allow clans to help support their newer players with good resources as they deem fit and will lower the barrier of entry for new players in clans.
Fun stuff:
Add some kind of shop for cosmetics on the clans page that can be purchased.