Not really sure- what defines a 'luxury', really?
I enjoy crafts, but I don't know how much of a luxury that is, given anyone who makes stuff on a regular basis has a stock of supplies around, so you don't actually buy much.
I have a weird thing about storage- I just really, REALLY like bins and boxes. Ikea & the container store are great places to just look around for fun. Although, considering my mom's got a thing for jars and my niece loves bags, I think it runs in the family a lil' bit.
Given that my circle does tabletop gaming as well as videogames, I have a notable lil' pile of dice. I have a spare Chessex Borealis Clear D20 I'll trade for the matching D4!
I only add to it once a year (save for the new quarters), but I collect US coins & currency. I guess that qualifies as a luxury.