Sort:  

Definitely. Not needing to grind just to get back what's spent on rentals makes my playtime more relaxed. And yeah renting out all my cards will potentially earn me much more than actually playing but it's less fun and I still enjoy the game so I prefer to still do battles and use my cards instead, and hope to get something good in the chests.

Ahh yes, I just rent doubles that I don't need for the CP anyway. So getting a bit of extra passively while also playing and getting rewards