The more premium or fragile the collectible, the less tolerance there is for lazy hardware assumptions
Like Thoughtseize, for example
If you want a very high quality scan you need to invest in a scanner (such as v600) and also invest in the cards you want to scan (price depends of card) or you have the free alternative that is basically editing photos and scans that are available online
Last year, leaks emerged via trademark filings that Pokmon TCG would release a card set in Japan focused on Pokmon from Pokmon Black and White
Second, theres all new art for every card, so there may be some unexpected demand that randomly drives up prices
Among the most valuable cards in March of the Machine, there are a ton of serialized cards, which skew the value of regular cards by an astronomical amount and are not included in this list