PMs can minimize their suffering from unrealistic expectations by showing comparable properties that are on the market for rent and having a discussion with the landlord as to how their property compares and how his property can be more attractive to renters.Landlords are running a business. 

that is totally unrealistic return.. your going to blow your 15k and be very dissappointed why would they give you 50k profit deals just to sell you a 15k course.. ??? 

So, perhaps you make a few offers which you know are unrealistic.  

I would say on a rental property that's unrealistic, if it really is an issue on a property, better to address the root cause.

My lender suggested moving a multi-family from my personal name to an LLC immediately post-closing via quit claim deed.

.$300k cash flow in 20 years is an ambitious but not unrealistic goal. 

Maybe the goal was unrealistic.

If the seller counters that I’m being unrealistic, I politely tell him I’ve purchased, financed or invested in over 650 properties.  

The info he claims to have is easy to find on the net or in a book but why deal with Section 8 housing problems when there are so many other investments that are nearly hands-free? 

Pricing tools that exist on the market are decent, but you also need to know how to control it, otherwise, it will go nuts with unrealistic rates far out and extreme last-minute discounts.