Got an email from someone at work, and it included a number of attachments. Turns out there were no real attachments, just all of the images that this person includes in their email signature. I turn to my neighbor and ask "Am I a crotchety old fart if I don't like seeing all these images pasted into email signatures? Doesn't anyone read RFCs any more?". He did tell me I was a crotchety old fart, but he did agree it was kind of ridiculous the number and size of images in signatures these days.
Then, inspiration struck. Stick a google display ad in your signature. Stick an Amazon affiliate block in your email signature. Clickthru rates will stink, but think of the pageviews!