Well a little while ago I wrote some php to test if I was getting img src hits. It logs the accept: headers into a text file for one. The other part is it increments 2 values in a mysql table. One is called through a php include(so it'll load even if it's img srced) and the other is called through an img tag so it will only load on a real hit.
So far it's about 40% img src traffic. It's only been a few hundred hits, let's see how well the rest of the 10k goes.
So far it's about 40% img src traffic. It's only been a few hundred hits, let's see how well the rest of the 10k goes.

Let's say your method is not up to par... even 30% is insane!



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