HTML Obfuscation

greasemonkey allows people to easily spread customizable scripts that just rip out the good bits of any web page and discard ads. if that spreads much and is set up to automatically download new scripts, the only way for web pages to fight back and make their ads be displayed would be to constantly change their html.

the server could send out different versions of the html every time. or load it down with huge amounts of junk (just like is already present in microsoft word generated html).

This would be really annoying and would slow the web down a lot.