Unless he has a somewhat unique psychological profile, the buyer who pursues houses not on MLS is either an investor looking for a fixer he can purchase cheaply or looking for a property he can buy subject to the mortgage while putting in low or no down payment, or someone who thinks he will be able to cut the price by the amount of the commission the seller is saving.

If I had to get to $100k/month in revenue, I'd take the hybrid option, save my W2, do some value add rentals that I sell/refi over 10-15 yrs to take advantage of appreciation and debt pay-down in addition to cash flow with the goal of having the ability to buy the exact assets that fit my lifestyle in cash, but unfortunately I don't think that's a super popular strategy, more for psychological and cultural reasons. 

Not saying we won’t have a slowdown or crash or whatever but it just is interesting how human psychology works.

It's about the psychology of the person who is selling.  

Also, this topic has two perspectives when it comes to the response: one is based purely on math/economics and the other is psychological.

I wouldn't mind having a prop 13 like ruling in PA not going to happen..We are both advisors and know that financially suboptimal options are fine for a primary residence it's all psychological and emotions based like almost every other financial decision.  

Its always funny how the psychology works. 

I agree completely with you regarding the psychology, and I should have done a better job qualifying my question:What list of keywords have people been successful with for PPC marketing (in addition to the ones mentioned above)?

The psychology of this will modify your spending habits. 

Therefore, my personal finance and investment psychology is closely linked.