For every dollar put in, the deal is designed to generate the equity multiple dollars out.

If that baseline average is an acceptable figure, then go a few notches up from there with your design and amenities and you should do well. 

I'm hoping there's a simple explanation.

Then if you are only looking for cosmetic flips then you limit your targets and increase competition because every wannabe HGTV, realtor, interior designer, contractor, handyman is looking for the same easy flip.Its doable but lots of strategy and organization, hustle. 

I have found lots of heirs with that simple method.

Look for the Certified Cost Segregation Professional (CCSP) designation, which indicates certification by the American Society of Cost Segregation Professionals (ASCSP).

tons of real estate investing podcast on apple podcast such as BiggerPockets, Lifetime Cashflow through Real Estate, Multifamily investing made simple, just to name of few. don't forget to listen to motivational and self improvement podcasts because mindset is everything 

So simple so powerful yet so many people will come up with so many reasons not to do it!!

I build at simple closet with accordion doors to make it as some and cost effective as possible.

In contrast, STRs work this way intentionally, by design.