I like to do informal research projects and learn about things. For example, I have an antique glassware collection that I regularly add to and read about. I like to learn about the various patterns, companies, colors, materials, eras, etc. so that I can recognize and appraise pieces when I see them.
It makes me feel good about myself to consider myself an "expert" in something and gives me something to talk to people about that I have confidence in.
I also like to comparison shop for stuff online and see what thing has better features, better quality, is prettier, is cheapest, what people have said about it, etc. Even if I do not end up actually buying it. I just find it interesting. And if I meet someone who is looking for something I have looked into, I can give helpful advice, which makes me feel good.