If there is very low activity they either reduce the price, or perform minor rehab in an attempt to move the property - just like anyone would do when they have no choice but to sell a house. 

And since we only buy under value, we can (usually) get them to appraise high enough once the property has seasoned (usually a year) that we can refinance out our entire loan with a bank on the back end and substantially reduce our cost of funds.But with buy and hold (as with most real estate), finding capital is the hardest part.

Frame it that way and you may be able to get them reduce it..... 

Bottom line-they saw I was an investor and back pedaled reducing the appraised value of my property and then reducing their offered loan to 60%.

I take care of all the potential problems as soon as I purchase to reduce unexpected maintenance expense in the future.  

Thus, making it less attractive since the equity interest in the property is reduced. 

The following was found in a google search:When septic systems are properly designed, constructed, and maintained, they effectively reduce or eliminate most human health or environmental threats posed by pollutants in household wastewater.

That doesn't make it a bad deal but it will reduce your rate of return.

This has greatly reduced my workload and I don’t think I am missing anyone since the #1 question they ask is if the rental is still available since there are so many stale listings out there.

However, this issue may get more complicated in states that have medical marijuana.