I just keep trying to convince myself I have all I need, like lying to myself...... It's no different than some other hobbies like guns. I buy what I tell myself is the last one or last accessory (and tell my wife the same) only to find something else or find an excuse to make an addition to the current pile.
I recently did this with a blade purchase, I ordered a Medford Praetorian, told myself that's it and I really don't need anything more (wrong). I have a small spectrum but very useful pile of blades. So like many others, in the mean time I cruise the forums, I am in the learning curve of blades so there's plenty to read, see who has what, some peek interest but I can typically say "NO" but then I talked myself into "needing" one more fixed blade. From that point it was game on, I knew exactly what I wanted! Thank the lord I found what I was looking for this morning in the sale forum (Winkler II SAR) and bought it. Now I can tell myself and explain to my wife after I tell her I bought another knife that this is it..........
She tells me I need to go to group therapy as I have an affliction with collecting soft shell / hard shell jackets too (zip up, pull over, hybrid, half shell). Ah yeah they aren't cheap either at $400-500 a pop.