Hmmm... I just looked at
this post.
Because the images are large, I did a right-click and "Open Image In New Window". What I got is: "You need more Karma in order to download this attachment!"
This ties in with my earlier post: this makes for a horrible user experience. If that happens to me on a site that I visit casually, I'd be very likely turn away and look for the information elsewhere, rather than submitting to being patronised by mindless software.
At the very least, if a download is being denied, there should friendly and detailed information as to why that happened and what to do to make the download succeed. But I can tell your right now that, if I'm required to make five posts (or whatever) first before I'm allowed to download what I want, I won't bother.
I strongly suspect that this Karma thing may turn out to be bad Karma...
Cheers,
Michi.