Oh, good lord. Aviation is the TEXTBOOK casestudy of economics...
If by your definition of textbook, you mean words on a page incapable of changing in a dynamic fashion, then yes, I agree.
Aviation is far from that, which it the point I was making. The presence of
people, who have beliefs about the ethics and moral fabric of our modern system of economic realtionships makes it so. A textbook will simply point out the realtionship of supply and demand. I takes nothing into account of how people, in this case pilots, react to how a demand for pilots is filled. In a static system, this oversupply of pilots would dictate that every pilot position would be PFT, and wages would only be high enough to keep the stack of resumes that arrive every day at a level equal to the number of pilots who quit in disgust. You could have no pilot unions, because this moderating force between the interests of management and the interests of workers would upset your static model.
Every potential pilot candidate is, in effect, starting their own business. Technically, CFIing is PFT. If, perhaps, you don't want to instruct, as many do not, you'd have to pay for a certificate(s) that you'd otherwise NOT NEED.
First, not every CFI is starting his own business, nor is every pilot candidate. You don't need to pay for certificates that you don't need. If your father owns an airplane, and you want to fly it, you don't need a flight instructor certificate to do so. You WILL need a certain amount of experience, and a pilot who has the requisite experience will have to teach you and watch over you until you are insurable. Chances are, that person had some experience as an instructor. Isn't that a bit of irony?
The reason that being a CFI is not the same as PFT is that you are not purchasing a job at a particualr place when you train to be a CFI. You can instruct anywhere the FAA has jurisdiction. If you could ONLY instruct at the school where you trained, the the FAA would be a co-conspirator in a PFT scheme. This is not the case.
Now, if you can gain the necessary experience through paid work outside of instruction, and you can pass muster in an interview, then good for you. If, however, you pay to occupy the seat that should be manned by a qualified pilot,
that is PFT and is a different matter alltogether.
I hope that helps you understand what PFT actually is, rather than what you might like to define it to be.