This *FEELS* (not saying it is) like a false claim. Much like the much upvoted (and later debunked) HN post from a while back when a iOS developer claimed that Apple always keeps it 30% commission, even on a refunded purchase. I consider it worrying that a claim wholly lacking evidence is getting so much attention. https://news.ycombinator.com/item?id=23995750
Do you have any evidence aside from a feeling? Just curious.
I agree with rblatz's response's reasoning.