One I thought of was credits for upgrades. Generally being able to buy more usable features with credits. Maybe paying credits to add or change signature slots. Maybe paying some credits to change avatar. Pay to change username? Basically the more you contribute and stay active the more you can do idk.
Credits for upgrades will never happen. It's the main source of income which we need to for pay servers, cdn, graphics and fund events. We won't provide buyable features for credits which upgraded members have. Kinda defeats the purpose of upgrading.