Hello.
The idea is seem interesting and I would like it to be implemented, but in a rather diverse way, for example, after 1 year of using xat, you have the option that once every 3/6 months, you can choose how to be "rewarded".
But on the other side there is a problem: those who use chat rarely, and who would like to find solutions to "steal the start" that is, just to log in and that's it, without even a minute of further activity.
I believe that a safe and fair alternative must be found for everyone and the rules should be clearly expressed, without risk for interpretation.
As a few reward methods I would see: a discount for future purchase of xats from the store / a limited pawn of your choice based on the powers you already have.