I understand your point and I've wondered about the same thing.
1. At least some states still have restructions on the advertising methods available to attorneys
2. I get those IT and development service pitches also - and many are SPAM. I'm probably like a lot of people that just delete the message and don't think about it again as long as the same company doesn't make it a habit. My guess is most attorneys or law firm are not going to engage in those practices for fear of the consequences / damage to professional license.
Or it may be that many of them just aren't yet cyber-savvy.
3. Like a lot of people, attorneys might not be aware of the number of "home based webmasters" earning income from advertising, PPC programs, etc. with websites. And not aware of the extent of the copyright problem - or the potential for business.
Or maybe they are aware but have the misconception that the only thing available to them here is a bunch of $50 disputes.
All I can say is the attorney I talked with was with a firm with offices in some expensive real estate and he certainly seemed to welcome my potential business.
Look at it another way. If a number of attorneys realized the potential and took advantage of it, the problem would start to go away. It's like the TCPA and unsolicited fax advertisements - once attorneys and individuals learned how to make money and use it to fight the practice of unsolicited fax advertisements, that practice slowed drastically.