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Thats a good question.
If you sell all your cards and buy SPS and then stake SPS you earn about 300 % in a year just now. That is much more than you earn by playing. It is about 10-15 % per season.
But that is if SPS stay at same value.
ANd ....the APR will go down but still it takes a long time before it drops below my calculation playing and earning.