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It is about the bigger picture; trying to reduce the number of cards in supply in order to create more scarcity. I do not care if they have a bunch of lvl1 cards themselves, they are also then forced to burn DEC to list them. So all in all a DEC sink and probably more stable pricing.

When I started and rented cards I got frustrated when I slipped out of a league because some cards got cancelled and then 10x-ed in price because of end of season pricing. When this season long renting kicks in I think that it will be more beneficial for players trying to rent a deck for playing a whole season and not being subject to last day raises. But we will see.