Thanks with all the replies.
With the off-season question, I only been in the hobby for about 6 months, but I have a friend been in hobby for 15 years.
He told me the card value generally drop around 20% over the offseason.
High end cards values normally less variable than low end cards.
With John Wall, its bit strange, the value actually increased a bit over the play-off. I think it's because when people watch Rose, reminds of Wall.
Wow - must say you've sprinted off at the start to your collecting there mate! I've been in this caper for years and haven't even come close to anything that nasty! Hope you keep up the pace!