I am wondering about HTTP_REFERER being blocked by products such as Norton Internet Security.
If you buy and install a straight version of NIS, you will find that sites protected by .htaccess will not show any images at all. All you will see is placeholders.
Your average punter will not have even heard of ZoneAlarm and will just visit a store to buy Norton or other brands which seem to be adding Ad-block and Privacy stuff.
I am also wondering how much market share Norton has (and products of similar Privacy control).
But what is really scary is the thought of cookies being blocked, especially CCBill cookies.
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