On the first part, you're wrong - although, I would tend to agree with you
The jersey sold in an open online auction for $3500. That in itself, makes the jersey worth $3500. It's a lot like art in that way...it's worth whatever someone is willing to pay for it at the time. Though like you said, for me, no jersey would be worth that much!
As for the second part, to each their own. I have replicas purchased from the team store, and also a few game worns purchased from the team store and other places. I like the replica's because its much more cost effective, but I also like the game worn because it makes me feel like I'm holding history in my hands.....perhaps silly, but it's true!