Earlier quoted context omitted.
Yes, but about 100% of email clients now don't load images -- whether webbugs or actual content -- because of that. This BGSOUND tactic certainly isn't standard practice, despite being an extension of a prior technique, extended specifically to get around the existing filter.
You don't list a source, but I'll propose a different stat. A survey in 2010 implied that only 33% of folks kept images on... but that's a wide jump from 100%. http://www.clickz.com/clickz/column/1716214/disabled-images-... Your point is right, that emailers are trying to get around the image blocking... But it's not that everyone turns off their images; some folks still keep them on. The question then becomes: what'…
Putting img tags that link to your server doesn't sound like a very good way to get attractive emails anyway. What if your server goes down? What if the user disconnects from the internet before reading their inbox? What if the user rereads your message after several years and it's suddenly not so attractive anymore?