I hear you, T, and I have the same philosophy. The part timers are actually the worst of the bunch. That's not to say all part timers are bad, only the ones that adhere to the following mentality..
I had a customer I serviced three years ago. The price for his service was $800 and we had it done in about five hours with three guys. Genius that this guy was, he calculated material cost of $150 and figured my labor cost was maybe another $150. He must have commented ten times how he wish he made $100/hr and that he knew doctors that didn't clear that much etc.. genius had no idea what it truly cost to run a business. Sure enough this bozo starts a "pressure washing" company on the side. His marketing was targeted directly at me (Don't pay the ridiculously high rates the pros will charge you.. pretty clever, huh?)
He made $40K per year at is full time job and lived modestly so I guess he figured he could charge half of what I was charging doing weekend jobs and make just as much as he made working all week. He was a complete hack but it took a year for people to figure that out and he drove rates down because if nothing else the guy was an aggressive marketer. Long story short, he ended up leaving a pile of oily rags under a deck and they caught on fire and the deck was destroyed. NO INSURANCE. He was operating as an unregistered sole proprietor so whatever meager net woth he had was wiped out.
Now I didn't want that to happen to the guy but this whole diatribe is just supporting what Theresa just posted. Do it right. Don't undercut services because you think you can live on less. Don't think that a valid sales pitch is "we don't have the overhead of the bigger companies so we can charge less" You'll either be just another statistic or a paid employee that calls him/herself a business owner.