I was actually going to post soon about a good friend of mine that's currently a home inspector for last 6 months and trying to figure out his path.
He had similar thoughts that it sounded like an interesting and potentially rewarding gig, be his own boss, etc. He started with an inspection company that sold more opportunities for inspections per day than it ended up being (inspectors were doing three houses a day when he was talking to the owner, now he gets two houses a day max and some days just one). The percentage he gets of each inspection also isn't that high so at the end of the day with mileage and gas prices so high, he doesn't make a ton per inspection.
If you can find a hookup to have a flexible schedule (most folks are referred to inspectors by their realtors, so thats the way to get in the door), have all the inspections in a small radius of you (to save gas $, and vehicle wear and tear), and have a fair bit of time and some cash for the certification process, then doesn't sound like a bad gig. If not, it seems like it would be tough for it to be worth it.