It is not always correct to assume though that it is because we cannot earn money in any other way due to lack of education or being too lazy.
It is a logical conclusion to make, as if there was an ability to earn the money without selling her body and entering a "job" that most "normal people" regard as degrading and discusting she would do so.
I have yet to meet a Pro$$ie who gave up /or declined a WELL paid job to become a pro$$ie.
And as for education, it has been said before you don't need a degree to suck cock, and as such wasting time at Uni in their most valuable years (18 - 21) would be a bad investment for a girl, as their body is a depreciating asset and something guys will in general be less willing to pay for as she gets older.
Can you give me an example of any pro$$ie who has either
A. Turned down well paid emplyment and continues to do so to be a pro$$ie ?
B Has a valuable degree in something other than "Hair and beauty" or "media Studies"