They may look at 10-15 rentals and if applying ahead is required they might be spending a full months rent on applications and not like any of the places. 4.

Or judge always protect tenant?

In both cases after they moved out I had to spend a lot to bring the property back to its previous condition. 

If these  "guru's" are so good at wholesaling, why do they spend so much time and effort selling their programs?

Many think they can hide but the moment they finance a property all of that goes away, so most spend thousands to setup some tricky system to try and hide there name that can be found online for free.

One of the biggest mistakes newer investors make is over-rehabbing houses and spending too much money on these low ARV homes.

If you don't like Dave Ramsey then we can look at Big Bang Theory where Penny borrowed money from Sheldon and even though he didn't care about what she was spending or when she would be paying him back, every time he said anything she thought he was grilling her about that. 

How much will you have to spend to make those units worth more to the renter?

A well written management contract should clearly spell out what is expected of both the PMC and the owner, to PROTECT both and avoid misunderstandings.

Like with so many things, awareness and access to information leads people to take less favorable options when spending their money.