Pokmon cards become valuable due to factors like rarity, condition (graded by PSA), and historical significance, such as first-edition or promo cards
You need a specific objective or a certain board state before you even consider investing resources to crack open the battle (apart from discarding a card, paying three mana, and tapping this thing)
Prices are based on actual completed sales and not listings
The prize cards, which auctioneer Fanatics Collect (formerly PWCC) states were given to the top three players from each region, all featured Exeggutor - a reference to the tournament's location
For more information on Mystery Boosters, check out the release notes on magic.wizards.com

Elite Trainer Box EB Games: $199 | JB Hi-Fi: $100 ( 99% increase at EB Games ) Ultra Premium Collection EB Games: $599 | JB Hi-Fi: $360 ( 66% increase at EB Games ) Binder Collection EB Games: $129 | JB Hi-Fi: $65 ( 98% increase at EB Games ) Ditto Premium Collection EB Games: $159 | JB Hi-Fi: $80 ( 99% increase at EB Games ) Figure Collection EB Games: $119 | JB Hi-Fi: $60 ( 98% increase at EB Games ) Booster Bundle EB Games: $109 | JB Hi-Fi: $54 ( 102% increase at EB Games ) Booster Tin EB Games: $89 | JB Hi-Fi: $54 ( 65% increase at EB Games ) Battle Deck EB Games: $79 | JB Hi-Fi: $40 ( 98% increase at EB Games ) Tech Sticker Collection EB Games: $59 | JB Hi-Fi: $30 ( 97% increase at EB Games ) Mini Tin EB Games: $39 | JB Hi-Fi: $20 ( 95% increase at EB Games ) We are hoping that this is some kind of mistake, as we havent seen this with past sets, although given the increase is across the board it seems very unlikely at this stage.