It could also be inflated due to increasing demand for these cards. If more players want a certain card and there are less copies available out in public, prices of cards should rise. Prices also rise based on Kate selling prices or available Clintz to each player from playing games.
Regardless, this is also because players are not willing to sell them at low prices. As lovehinanaru said, the prices are inflated and there is a possibility it might go down when more copies circulate in the packs. Likewise, the price might go even higher than 120K and 300K for these cards depending on demand.
This possibility is true for any card, usually Rare Cards.
Nothing significant I can think of as to why the Hive`s prices rose given we had the Clan Packs last week from memory.
I'm coming from the past and giving vision of old investor.
Current market is subject to two different things: The Kate sell price has set new minimum to prices which creates two-pronged effect - relative card values have been altered quite a bit by the minimum price between common/uncommon/rare/cr system buy levels - the new way to deduct the price for new system for old fart like me is like this : "PRE-CHANGE PRICE + SYSTEM SELL PRICE". If Mawpin used to sell for 1500 previously - current system adds artificial 9000 to it, making current price about 10500.
Other thing is that game rewards players a bit differently. The money from matches seems to about 4-6x more than before. This is good for active players, making market have more "effective money" for playing the game.
So as investor I simply account for generally higher prices, acknowledge the relative value changes based on rarity and expect a bit more loose money from players. No need to dump. The change nets about +-0 regarding investments and effectively simply adds one zero behind the prices as overall system-driven inflation.
If the changes were designed to affect the investing/market play it .... well, it didn't work effectively. If UR ever needs a consultance how to iron out the market please consult me, I can help lessen the gap between new players and investors and make the market make sense and not be punishing.
*Currently sitting on 250M net worth cards by doing much nothing on past two years*
Simple solution would be to reward the play instead of trying to affect card's values. Investors have large card pools and that means they have always resources to put power to cards that are market-wise beneficial - aka they can sell the cards that lose value to gain cards that gain value. Basic stuff.
When you reward active play over passive things (like owning cards) you create constant advantage to new players - because they gain profits by participating the matches. The reward of active play is best when it's given in packs and the packs should yield MORE cards than they currently do - that way you generate supply and start the clintz to travel to the side of active players. At some point the market will be saturated and the old investors need to purge their supplies - making prices fall for real. At that point profits from playign matches (wage of playing the game) has more purhace power which is additional benefit to active players/noobs.
The problem in markets is created by Boostr by systemic lack of supply of cards, the artificial lack of supply drives the prices high and makes market play very easy - all you have to do is own cards and you get money, because every good card is bound to be undersupplied. They are so undersupplied the price gains allow the tweaking of even not-so-good cards.