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Also, available cards, doesn't mean available BCX.

Yeah. it means you cant really make a lot of max cards. For the cheapest summoner you can only buy 6 maxed cards and barely combine 3-4 more. Thats 10 max summoners.
How scarcer do you want to make this?

I suspect most of the sales on those lame Summoners were in anticipation that they would play a more significant role on land. No one is using them seriously for gameplay.