IMHO, the personal chef 'training programs' are a ripoff. If you don't have good basic cooking and food service skills, don't go there. You will NOT be taught how to cook, you will be given business plans on how to make money, and lots of 'assignments' you have to complete yourself, w/o much 'class' time. This from a good friend of mine who did go.
Personal chefs are more and more in demand, not only for the 'other side', but for homes where both spouses work, and want a 'table' ready meal when they get home; for invalids; for new moms (what a great baby present that is!); or for folks who want to hire out for a party.
I think the idea is great, there is a lot of money to be made - again, if you have the cooking, food safety/service knowledge down pat. The down side is schlepping all your gear to another's house, spending lots of time shopping, and (this is true) getting calls in the middle of the night saying things like "I reheated it just like you said, (hah!), and it didn't turn out right".