Bullshit. I know Hubbard said what you are repeating, but it isn't true. It depends on the pricing, how much you charge for auditing and how much for a training course.
Let's say 12 1/2 hours auditing costs $4,000. How long does a course that costs $4,000 take? I know it depends on the course, but it is weeks or months of courseroom time.
$4,000 worth of auditing takes up, say, 15 hours of an auditor's time, plus some hours pro-rated of the C/S, D of P, tech page, and assorted back-up staff. Other auditors share the same staff.
$4,000 worth of training takes up months full-time of a course supervisor, course admin and assorted admin back-up personnel. Again it is pro-rated, and the more public there are the more efficient it becomes. But it needs the same number of staff if there are 20 students or 1 student.
If you're like Flag and use interns for months and months of delivering paid service to FSO public, where the interns themselves get paid zilch and are treated like dirt, that might help with the "training is the key to income" line. Also, an org needs auditors, and the best way to get them is to train them up, so in that sense training is the key to future income from auditing.
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Paul