As value goes, sometimes I make a purchase because I know I'll never be able to get that deal again. For example when I got the chance to purchase nearly fifty decks of JAQK playing cards for a little over $225, I knew that I would never have this opportunity again, and since it's my all time favorite deck, I just had to.
now that is a good deal, but I don't think I will buy 50 of them.. that is a supply for a lifetime.
50 decks would be overkill for me to, but for anybody that does magic or cardistry. They could go pretty quick. At $225 that was a hell of a deal. loldudex2 could have easily tripled his money.
...... it is satisfying when decks I buy become sought after by other collectors. Not financially rewarding, because I have never sold a deck and don't plan to start. But psychologically rewarding. I don['t get the impression that I'm weird in this respect (though anybody who collects playing cards has got to be a bit weird), and I think this is probably an element of collecting for a lot of collectors, irrespective of what is being collected.
I usually don't buy on a perceived value, but since I buy several decks through KS. Sometimes it makes since for me to buy a few extra. When you consider separate shipping, sometimes it can save you a couple dollars per deck when buying multiples. I didn't sell any of my decks for the longest time. I had several extra decks that I ended up selling earlier this year. I made a great profit on some. Some not so much, but I didn't lose any money.
If you ever start collecting vintage decks, you will notice a different mind set. A lot of collectors will sell really rare decks, because they want to share that history, so to speak. They keep and cherish it for a while, then pass it on.