(keitai-l) Free drinks for mobile developers & query

Hi all, 

Now that I've got your attention, could anyone offer any assistance with
this?  ;-)

I know i-mode takes 9% of the user access fee (JPY100, 200, 300) for the
official sites. What about any sales that happen on the site. If I buy a
book from Kinokuniya's i-mode site, does DoCoMo also earn (ha!) a
percentage? Does that billing also show up on the user's keitai bill?

Thanks,

--Daniel Scuka