At worst they offer incorrect and damaging information costing the recepient loss of money and time, and in some cases leading to damages to the people the “mentored” are dealing with .It is fashionable amongst those with limited formal edification to buy into the self servicing bs put forth by those selling the $20-40k programs that formal education is a waste of money and time, and actually may be harmful to your success. 

I guess my greatest beef with most gurus (not all, some are actually honest and straightforward, and even offer marginally beneficial advice) is the following1- they’re dishonest in numerous ways2- completing their training in no way qualifies the student to earn money or even perform competently in real property field3- the techniques they teach are often harmful to the people their students deal with4- they unleash a horde of unprepared, unqualified, unknowledgeable, misguided and unaware newbies on an unsuspecting pool of desperate homeowners5- they sell the song that all formal education is a waste of time and money6- they never provide any audited proof that they have been successful in real estate investing7- they encourage people to pay for a mentorship plan they can’t afford by increasing the limit on their credit cards8- they create falsified accounts to post how great their program is9- their programs are packaged by professional seminar companies out of Provo, Utah or Las Vegas, Nevada10- they disparage people who have spent years accumulating the knowledge, experience and capital necessary to be successful in real estate11- SOME gurus teach techniques which are unethical, immoral and even illegal. 

All in all, not much harm done. 

But, going to college also means you can learn a lot more about subjects that will enhance your knowledge and be useful later in life.

He could tell by popping off the doors they the insulation was falling off (sparks flied at one point) and the evaporator condenser was heavily corrosive which can leak harmful R22 refrigerant into the home plus found bio growth inside leading to potential health concerns.

DO NOT take short cuts that could harm them intentionally or unintentionally.

No real harm in bringing in your CPA at any stage of a project or planning for the future.

I someone has something in a private area, that's not for me, but as long as we're not intimate, no harm, no foul, nor do I really care.  

I also let them know that an eviction will harm their chances for future rentals.

In hindsight we could've gotten the properties without them because the potential for tenants causing harm is greater than the benefit in having them.