I’ve been doing this and had a moderate success with it. It takes a little bit of time to see Splinterlands cards as assets that I own and can lease out for other people to play. I just need a lot of Steem to get some of the more expensive cards.
But I have made a fair bit of passive Steem through card rentals and I highly recommend it.
yea its a great resource. I particularly like getting to try out new cards/promo cards that I probably will never level up.