Guild Upgrades.
Currently to do Guild Upgrades players Donate or Purchase required Gold, Contribution, EKs or Majestics.
If each “Upgrade” had a fixed Coin fee eg:
RM 1 - 50c
RM 2 - 100c
RM 3 - 150c
Then as you progress and/or contribute the fixed fee will fluctuate accordingly to the contribution.
An example would be you have Donated 100eks, 100 Contribution but No Gold or Majestics, To now auto complete RM 1 you must donate 23c to finish or continue to wait for future donations.