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focus on Bing and yahoo which still respect a webmaster
As for the results pages, it's harder to tell because they are scripting the whole thing and the code is non-obvious, but I don't think they are hotlinking the images there. It looks like they have their own version of the image resized to their specifications, which would be the way to do it to maximize speed.
The actual page is shown greyed out in the background however the images are been served from their cache since the image is not always the up-to-date one
When they blow up the image with my page beneath, the photo's resolution is blown up from their thumbnail so it just looks terribly "out of focus".
On the other hand, my clear image is below, so maybe people will click through to see it better...
Does someone have any CTR loss numbers when allowing hotlinking?
I had a huge problem a few months back with over 200,000+ requests per month for just three images.
No one, absolutely no one clicked on anything
Why you had such a loss is because your images most probably came up for unrelated topic, normally not resulting in any clicks.
As for losing rankings -- well, there's not much to lose at this point. Image search traffic has never been worth much, and now it's probably next to worthless. However, that's one reason to watch the numbers for a month or so before acting.