Late reply, but for me, it's for the profit. I clear easily 70m on CC most years (where does it all GO? No, wait, I know. Stamps). I only donate r90s if it's near the end and I'm bored. Priced at 1200 np, they fly out of my shop. If I sell even 50k of them for that (and it's usually more) that's 60m and I will have paid maybe 20m for them, if that (because lots are free from dailies). Plus, it's so spread out, i don't notice buying them, but I sure notice the profits in my shop during the event, lol.