I like how you basically describe pack owners almost as if they are leeches / not contributing unless they also buy SPS, despite the fact that they funded the development of the game in the first place. lol
"first we make them buy the thing, then we make them buy the next thing, or their first thing stops being useful"
It's tried n tested strategy here. "Oh you bought land? but now you better buy all these other things or it wont do much" ... "oh you bought cards to play the game? you better buy SPS or we'll rug pull the rewards"
Where are the actual rewards, instead of punishments. This game got lots of attention when there were rewards with the big SPS airdrop. Now every announcement comes with an invoice of what you need to buy next