I think that restraint in buying shaving gear probably has something to do with one's age and stage of life. At some times in the past, I showed a bit of restraint; but now, at age almost 75 and retired, with very few hobbies, I see no reason at all to restrain myself. I gave up some time ago on the idea that I had to use up all of my gear before I was forced to stop wet shaving (or until I died). At this point, if I feel like trying something new, then WTH, I'll buy it.
John