I very rarely redeem for myself as I only just make 1K naturally - so redeeming puts me in the territory of having to do a MR.
I do redeem for my kids, and I won't buy them C, it's at 2+cpm.
On the few occasions I do it for myself, it's either because I need C or because I need changeable tickets. Either way, it's at much more than 2cpm.
I'm considering switching to BA or AA next year and, if I do, I guess that I'll be redeeming a lot more and those numbers will go out of the window.