They'd like the sales taxes for your regional affiliate/salesstaff.

Do you use sealed CPU's? How about hard drives?

For that matter, do you know your cell phone's OS? (Can you edit and audit it?) How about your microwave, your car?

I guess you *can* chuck your CPU, drives, microwave, your car, your cellphone, and only go with open source and hardware that you can manually figure out "when it breaks", or you can leave some things sealed "because they work", and have other things open "to fix or replace by qualified people when they're broken".

All that being said (and you did bring up a car analogy on slashdot), if you don't actually know how to operate a simple welding torch, maybe you shouldn't be trying to open your car hood, and the people that *do* know how to operate a torch are those people who should be doing those repairs.

When I see pen-test as a career, that's generally a heads-up for me that a person doesn't really have any idea what they're doing. They're script-kiddies, nothing more.
OTOH, if somebody writes exploits, and detection scripts (snort's a good place to start), that tells me that they're not sitting around running nmap and expecting to be paid for it.