Jimmy Wales wrote:
At the present time, no ISBN links on the wikipedia are
generating any income
for the Wikipedia. Perhaps in the future that should change, but we have to
be very careful about such things, and in my experience, the amount of money from
such links is so low that it isn't really that important... not important enough to
damage our independent reputation.
Mindful of all the hazards of such things, this is certainly one of the
less obtrusive financial aids that might be available should the
situation ever call for it.
Eclecticology