I hear what you are saying: consumables and normal luxury items are hard to spend a lot of money on (houses, cars, boats, planes, clothes, food, etc)... if you however were to choose to spend a lot of money on the R&D required to reducing human suffering you'll find that the money will go like its on fire. Build a new drug, create novel ai tech, driverless cars... $1B would feel like you need to clip coupons for the grocery store.