You can absolutely spend however you wish. The fact is we live in a pretty self indulgent society. Yes, if you spend thousands of dollars on shoes (per year, lets say) I'd consider that to be pretty self indulgent. But if you can afford it, why not right? I think where it gets a bit unreasonable is when you have to start living a lifestyle that you'd rather not live because of your self indulgence. Though I'm not sure that is the reality in this case.