@Tikibo
I'm failing to see how 500-600 yen is at all bank-breaking enough that groups need donations to keep themselves in raws if they really, *really* have to scan for themselves instead of seeking out basically free resources that are still of relatively decent quality. Even with shipping included (which depends mostly on how much you're ordering and how far the order needs to go), you're not giving up an arm, a leg and what's left of your soul.
Volume cost alone for that OP volume you mentioned is about $4.60, well under what I'd pay for Viz's TL'd volumes in the US (before shipping, anyway). As FS points out, manga ain't only for the rich and well-to-do. Claiming that it's an expense no one in a scan group can afford to take on themselves seems suspect at best.
To Chrondoz's point, I've no issues with donating if the work is stellar.
tl;dr - I'm agreeing with what FS is saying, not going against. If that wasn't clear, I apologize.
@TheMinester Maybe.