However, no auditor outside of CofS I knew was doing what they are doing for money.
I haven't met one yet (and I've met a few) for whom making money was anything like their main consideration. Without exception they were auditing others because they wanted to help people, and it was the best way they knew of doing it.

No.
First of all, there isn't a single FZ auditor or FZ mission holder who will ever admit to themselves, much less anyone else, that they make more money delivering to those that leave COS than anything else they might do, because these are the only skills they know well.
That's a hard thing to give up. It's scarey to start over. It's even scarier to admit to one's self that more people have been damaged and died and left Scientology than have actually had their lives improved and that you, personally are part of that evil machine. It's easier to just continue on as you always have. More lucrative, too. After all, those gullible people are still around, still wanting the service. If they don't do it, someone else will, right?
There are some who have become exceedingly wealthy from their little FZ practices, but I'm sure they also say they "don't do it for the money." Everyone in the FZ or the Indies or whatever true Rons or whatever they call themselves says they "don't do it for the money". What kind of guru would admit if he did? That's just not a good guru image, and it's all about getting the person to believe you can cure them, isn't it? Helen Chen has become exceedingly wealthy from her missions. David Mayo made bucketloads of money until COS got onto him.
Helen Chen had a child die from neglect in her little child care setup just last year. Paying qualified staff would have prevented that, but that would have meant less profit. But she "doesn't do it for the money." It's for the expansion of Scientology, of course (but it so happens that as she invests more money in her missions, she makes more money). Hubbard wouldn't pay wages but instead used slave labour from the well-intentioned naive, but Hubbard made sure he was rolling in the money with slaves to jump at any little thing he wanted. He'd rather spend millions on race cars for his personal pleasure than pay a decent wage to the staff. How did he NOT do it for the money?
David Mayo had one of his ACC members suicide as well. She was on OT3.
Even Terril has a story or two of FZ clients who have not fared all that well.
I am sure not all the FZ auditors are getting wealthy from it, but quite a few are pretty well off from their auditing or mission incomes. It's a cozy little setup, where the brainwashing has already been done.
I can't even begin to comprehend the cognitive dissonance of continuing to use a cult technology to "help" people that is known to have caused more suicides, psychotic breaks and mental health problems than if people had been left entirely alone and never heard of it in the first place.
Someone with a pure heart would think twice about taking advantage of the victims of a cult.
I've been pretty easy-going about the FZ in the past, seen it as a stepping stone or a necessary evil, but so many people who should know better just continue to exploit the cult's victims year after year. Some even recruit their own. And looking at all these suicides, all these names, all these psychotic breaks, all the damage, all the pain, all the suffering, I wonder how heartless one can be to just ignore all that and still continue to call it "helping others."
I'm going to be on that Type III thread for weeks just gathering the hundreds, maybe a thousand or more names of the victims.
And still, the victims are ignored by COS, and still the true believers continue on, as if nothing bad ever happened, blinders on, because it's too uncomfortable to take them off and see the truth.