Great thread topic Ray!!! :thumbup:
I've wondered this myself many times. Never thought of bringing up here for some reason
I watched a special a couple years ago on (I think!) MSNBC??? Anyway, it was about collectors. One guy is retired, and VERY well-off, he now travels to South America several times a year to search for and collect butterflies. I'm sure his anual budget for that would fund some FANTASTIC knife purchases!!!
Another older fellow collects old trucks. Had fields full of them!
There were others but my mind is drawing a blank right now.
Point?
They discussed the reasons as to why people tend to collect things and the fuel that keeps the passion going. It was pretty interesting and applied very well to knives.
They talked about how it doesn't have to be anything expensive... maybe just symbolic of some other interest. One guy supposedly collects airline barf bags! :barf:

Maybe that's not way more weird than collecting knives, but it seems like it to me! LOL
I have come to realize that I collect shop tools. It's like my anvil. We all know I don't NEED a 450# anvil for knifemaking, but I had many reasons for WANTING it. So I got it!

If I had the money and space, I would buy all sorts of anvils as I just plain think they're cool.
I collect tool steel. I don't think I could use all I have now even if I could bang out a knife a day for the next 30 years. I mean, 1,000 pounds of W2 for a guy that is lucky to make a dozen knives per year?!?!

And that's just one type of steel, I've got hundreds of pounds of several others. I like "collecting" or hoarding it, as I see thousands of images rolling around in my mind of what it COULD BE.
So to answer you, I think a twinge of the tendencies are inherited.... Then after a spark and some exposure to something you like happens... the fire takes off and you are made.