[IDEA] Team buys Citadel Upgrades
Any team member can go to the citadel, select an ability, and click a button (or however you want to set it up) to "team buy". When this happens, each member is prompted with a little screen that says "Would you like to spend 500 gold for [insert upgrade name here]?" That way, it splits it for all the team members, so people dont have to spend all of their gold on a citadel upgrade.
Sure, when you play with your friends, you can split it up - but even then it is difficult because some cost 1200.. then 5000.. seems a tad silly.