On one hand they help me sell work. My clients see this stuff on the news and might decide to get serious about stuff I have been pitching. They are forcing companies to deal with security issues.
On the other hand, what they are doing is illegal and might make people who don't understand the nuances between white, grey and black hat hacking turn against us altogether. If I start getting FBI agents knocking on my lab door because I am running a legitimate external scans on a range of client IP's, my prices are going up.
What do you think eh-net?