Logging in to keep up with my virtual friends, community, and shopping.
I'm a reforming shopping addict, that Konmari'd everything and now lives a minimalist lifestyle in RL.
The ability to go online, and just "blow it out the water", helps with my urges to spend. My sims are basically ways to display my style and great finds. Like someone else mentioned, I often get a similar feeling or "high" from buying a nice outfit in SL, as I do in RL. This way shopping and browsing can remain a fun, creative hobby, without sacrificing my wallet or financial health.
SL creators, really do keep up with RL fashion and home design trends, and I've developed a more discerning eye from shopping in the virtual world.