My take is that any purchase that made you feel happy is totally legit - money can, in fact, buy happiness.
Back in the day, I used to spend a decent amount on MMO things (first LOTRO and then GW2) and then when I stopped playing I definitely moved that to a clothing budget. In the last two years though: skincare and art commissions. I might be a basement gremlin who never leaves the house but my skin is glowing, and I love supporting artists and having dope art. That said, in the last month I have bought hella art prints from artists I love as well because life is short and prints are forever.