No more than 80%... Really??

[Danual Berkley]

I've been reading The Book on Rental Property Investing by Brandon Turner as well as listening to the Bigger Pockets Podcast, and I've heard not buying for more than 80% of the property value was a must.

So what I did was run the numbers on some of the houses I'm interested in and it seems to really undercut what the asker is wanting. 

For example a seller listed a unit for $72,000.00 in my area, buying at 80% would mean I would offer them $57,600.00. That seems really insulting to me if I was the seller. 

So how do you even begin to achieve this goal of 80% without being told to F-Off???