They yield results, but I understand a lot of other people have jobs where they cannot spend so much time on their listings. 

Buying & selling Promissory Notes is a result of the intrinsic value.In fact,  a $300,000 Promissory Note is worth way more than its face value, because of Securitization.

The last part is where results happen.

The world of real estate has changed.The result of the lawsuits is that a REALTOR® is now required to have an exclusive buyer's agreement before stepping into/onto any property on a potential buyer's behalf.

Otherwise you have to plan for worst possible results. 

I am trying to calculate my returns over a 10-year period using the rent-by-room strategy, which results in significantly more cash flow than traditional rentals.

Most of the failures I’ve seen when investors attempt to “scale” a non scalable business result in only moderate losses and temporary setbacks.

Along with a kiddy-pool sized litterbox in one corner of a room, cat urine and feces in the OTHER corner of the room on the carpet (newly installed by the seller when I bought), and a smell that made my eyes water walking in the front door.The lease has a clause for Tenant-Caused Damages resulting from tenant negligence.

In lower-value areas like Sylmar, market values max out around $3.28 million, which results in a loss.The key takeaway?

Many “wholesalers” get all excited when getting a property under contract only to discover that a thorough inspection by a knowledgable professional results in repair costs 2 - 3 times higher than they calculated.