Investors will always pay for knowledge, either with time / cash / experience, so I guess it's up to them which they can most easily afford to part with. Beyond that, it's a matter of where to spend it.
There were a few threads about this group a little while ago.
See here, and my post (#2) links to a few others.
I made comment in one or two of those threads that I have a professional involvement with the group. No longer so, although we share some mutual clients and their Melbourne franchise does lease office space from me. So, take my thoughts with a grain of salt and assume that I'm biased somewhere along the way.
Their buyers agency does come up with good deals from time to time, but the benefit can quickly be eroded as they will still charge ~$10k (from memory) per property found. So, plenty of research is required to make sure that there is good value in the deal. That cost is by no means included in the 'mentoring' fee - which, I think, is now $9k.
Their mortgage broking arm has now broken off to be an independently owned company, and from what I've seen often prefers to use lower-tier lenders. They have a good handle on investment strategy finance but nothing has jumped out at me as being better than any of the brilliant brokers on this forum.
As for the mentoring itself... I deal with people who use PRE's guidance to buy an average of two or three properties a year. They tend to be good at pushing (rightly or wrongly) people into investing; buyers agency optional and commissions not necessarily the main motivation. They like to see clients achieving results - this is, of course, the best way for them to attract more people into the program.
Generally speaking, if the investor is self-motivated and self-educated, the PRE program won't offer a lot beyond the deals sourced in the buyers agency (which gives priority to the mentoring students). If guidance and education are needed, then such things need to be acquired by some means. $9k may be the price there; it isn't exactly small change for most small investors, so careful consideration is certainly a good idea before parting with the hard-earned.