mrkgnao: I agree, although it could be argued that setting it to everyone is opting in to it being used by anyone for anything. I wouldn't be surprised if you can already google public wishlists.
When I began harvesting the wishlists from the wiki, I decided not to contact every one of the 240+ users and ask for their permission, but I did make it clear that one could opt out by contacting me. No one ever did.
Fair enough, it was just a thought.
A possible explanation for no-one contacting you might be that a good number of people are no longer active here or on GOGWiki.
Regarding the low participation here - there's a good chance that people are missing this thread due to the many TW3, Galaxy and Friends threads, or perhaps not quite understanding the purpose of the thread just by reading its title, hence not opening it to read the OP. So, harvesting usernames and wishlist links could be the solution, and it's entirely up to you, but since you've started this thread, which is clearly opt-in oriented, going the other route now may be seen a bit as changing the "rules" midway. Also just a thought.