I think you can change the permissions for Unregistered / Not Logged In users to allow them to view attachments under Forum Permissions in the Admin CP. That might solve your problem without doing a lot of messing around.
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There are currently 1798 users online. 88 registered members and 1710 anonymous guests
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On our MB, that's a LOT of extra bandwidth that we'd have to pay for, for people who aren't interested enough to register & participate. The thumbnails give them an idea of what they're missing by NOT registering.
It seems to me that if they're computer literate enough to find your MB, they should be capable of registering if they want to see the full sized images.
Then again, the ads that are displayed to guests but not to logged in users generate significant revenue. So maybe you have a point.