Currently the text ISBN 1234567890 brings up a link to
This is fine. Wikipedia does not want to endorse a particular bookseller or
library, particularly when (heaven forbid) a vocal minority will shout that the
most famous bookseller is a bit controversial
[[Amazon.com#Patent_controversies]], though most people probably don't care.
To get from ISBN 1234567890 to another site requires the user to click on the
link and then search down for that site and click on the link provided. Two
clicks and a search, which is innefficient.
Thus I propose that the current system remains for logged-out users and by
default, but logged-in users can set in their user preferences which bookshop or
library they would like the link to refer them to. Have all the standard ones,
Amazon US, Amazon UK, Amazon DE, Bookfinder, Frugal, etc.
As a final note, there is nothing wrong in a charity selling things because by
its constitution it's non-profit. Therefore having a link whereby people who
click on it and Wikimedia foudation gets 2d for the link is not immoral, but is
clearly not immoral if the user consents in the first place. Think of it as a