I personally do have a monthly automatic donation set in the bank, it's not a lot, but I wouldn't say it hasn't occurred to me. I do try to save money for specific things however, if I made more and I didn't save e.g. I for sure would be happy to increase what I give monthly. My goal is to be able to do whatever I want, so for that reason I'm trying to save. Whatever I want would also likely be valuable to society (until AGI), and if I made more thanks to that, I wouldn't have problem sharing more.