Always an interesting topic. Except for the fact that some people spend way too much money on unopened product which is usually a money loser, unless you get lucky and pull one of the big money cards, "collecting" baseball cards is just like collecting carnival glass or souvenir spoons, or, or, or, or.......
As with any collecting interest there's usually at least some sense of value. Last year, due to financial reasons, I sold a bunch of my Ripken collection. I didn't get what i thought i should BUT I did sell them.
Point is ............ If someone is worried that you "wasted" money on cards you need to show them that it's not a one way deal. It's like stock prices; they go up, they go down.