Let's drink some irish whiskey in the jar!
To the point, I think you will not always have return from renting key cards, now you are lucky cuz of split rewards you will probably end up with little profit, but we all know that not always you will perform steady. Sometimes you will have really bad tourneys and you will get bottom rewards with little waste, but next time when in some of your tourneys you will have second round, then you can have a really big profit. Just look at these prizes. You can win even over 500 SPS I think it is totally worth to risk after all. If you fail nothing happens, you earn mentally experience, you will analize all your failures and you become stronger and ready for next battle!
!PGM
!LUV