In my experience, I haven't seen many readers tip 10K or 5k coins, but maybe you'll get lucky.
Right now, I'm working on what rewards to give my readers. So far, I may get some commissions done and then make some keychains with the artwork. Honestly, I feel my story is so bad that I'm surprised my readers tipped me. I do appreciate their support, though, as it means a lot to me.