I don't consider using NP on stocks or food club to be "spending" them. My question was more targeted towards actual NP sinks where the purpose of spending is not to get more NP. Money spent on things like stamp collections, pet painting, avatars etc will count, while things like investments do not.
After all, if the only things you spend on are things to help make you more NP, then what's is the ultimate purpose of earning all that NP?
The purpose for me is that I do things on impulse. At the moment I could care less about pet painting, but let me see something uber cute and that will change in a second. Then I'll want the np in the bank to go wild and buy 2 paint brushes, a morphing potion, and a few sets of clothing without breaking the bank.