Ron - but I do collect every other visual difference, including bullet types, seal colors or lack of seals, case materials, cannelures or lack of them, primer cup materials, primer markings or the lack of them, etc.
I would not, however, if I was the gentleman collecting .38 Special, collect bullet types that are known to him to be reloads. I see no point in that, myself. I could sit down with my auto pistol dies and load, myself, every bullet I could find or make into perfectly safe and shootable cartridge specimens, but to what end? However, if I did not have the headstamp, I would collect a fired case, a reload, a new primed or unprimed case, or a live round run over by a truck! They can always be replace later with a factory loaded specimen if one can be found. I have empty cases, though, fired or otherwise, where I have never had the opportunity to upgrade it, some having been held for years and years.
I used to break a known reload, collected by me simply for the headstamp, down to unprimed empty case, but I simply don’t waste the time doing that anymore, even though I still favor the practice of reducing reloads down to only known factory components - that means, usually, just the unprimed case. I simply don’t bother anymore.
I do lots of silly things, though, and admit it. I collect, for example, things like Swedish 9mm Blanks and Gallery loads by headstamp - absolutely meaningless since they utilized surplus and reject brass in the manufacture of them. I do this in many dummy round types as well. Very inconsistant of me, and I admit that.
You are dead on when you saw each person collects as he or she wants to and enjoys. If you don’t enjoy doing something in your collection, don’t do it unless the collection is a professional thing with you and the guidelines of that require it. For most, cartridge collecting is a hobby and should be enjoyed in every aspect. I used to enjoy cataloging each round when I got it - one could say that if your rounds are not catalogued, you do not have a collection but rather simply an accumulation. Yet, I have grown weary of all the clerical work I do despite ten years of retirement, and I have not catalogued a cartridge in my collection for going on five years now. All items since then are still upside down in my collection, my original way of keeping track of what still needed to be cataloged. The only exception is 9 x 18 mm Makarov, because for the last ten years or so, I have been making a special study of all things Makarov.
If there are 100 collectors, than there are 110 ways to collect.