As far as our OCD tendencies, I know old guys with over 400 military rifles, pistols which span 150 years. Historical and rare stuff.
Things which have actually been collected. OH! it's gold! Not if the wife and kids liquidate it!
Some have waited late in life and wonder what the hell they have done?

All the old farts who lusted after their stuff are dying off or already have 15 of each and are in the same boat.
The stuff is worth less than it was a decade ago for this reason and they will put on a few at a decade-ago price and nobody buys.
I get tickled at them asking a pile for an M1 Garand when the Philippines, Turkey, and Greece have recently repatriated about 3 million of the suckers on loan after WWll and resellers are purchasing them from the gov'nor and putting them on the market.
Not gonna be worth what the collectors paid for them any more. Why did they have to have 25 of the damn things?

Watching this stuff happen, I have kept my Milsurp collection to 5 rifles which are of the cheaper, more common stuff.
I don't care about matching numbers or what someone else has. Just enough to own some history and all being in good shape to go out and shoot without having to reload exotic calibers.

I have seen the razor thing go full circle also. Selling off duplicates was the first thing I decided to do. About done with that. Have sold some which I could never find again and have had the pleasure of owning for a while. No desire to own another.
Now I am chillin' with what I have and am happy to enjoy it. Someday soon, I will teach my middle daughter how to list them on ebay should something happen to me. I always say if you like it....It's for sale!
This pile of razors will be a glut on the market someday. Prices will go down I expect.

Of course if you want every razzer you see....Buy the damn things!