Good question. For the most part, I'd say the 'feeling like a kid again' aspect is the strongest (for me). I love sorting through cards, trading, scanning, displaying, attending shows and talking about them (Net54). The fact that they have financial value is nice, but doesn't drive me. I bought some cards 20 years ago 'as an investment'. I did flip them years later for a gain, but didn't enjoy it. Those cards were never 'mine'.
When my kids see me with my cards, they see the enjoyment. I love it when they say I should grow up...
