You have to be VIP to contribute gems, I believe. VIP1 for 15 gem contribution, VIP2 for 100 gem contribution, so people are spending money if they're contributing gems.
As for spending more money than I already have, probably not. I've been hemming and hawing over picking up VIP3 for auto-collect, but the money doesn't seem worth it to me at this point. Honestly the value just isn't enough given that I don't honestly know how much longer I will continue to play as things stand (this also isn't me saying I'm quitting, just that I'm not investing more cash at this point).




