For example, my goal is to invest for cash flow to sustain an enhanced retirement.  

Have you seen occupancy and nightly rates rise "post-Covid", and do you think its sustainable? 

From giving land to a University (to enable the University to build it's own housing and bring so much competition that you are chopping prices so low you cannot sustain).

You may also pursue justice for significant damages that you sustain.

I would step back and, if you haven't already, convince yourself that your business's banner year is sustainable before going forward.

I dont want to end up like everyone else, struggling to survive at 50+ years old with nothing to sustain me when i retire.

What it does is fill in the gap on what you need to have done to make the business work (which every guru sells) and what it takes to make it a successful, sustainable, life-giving business that can survive with or without you.  

Do your due diligence to find out if an MTR is sustainable in your market through Furnished Finder and REI meetups.

I haven't found any sustainability buying from other wholesalers because they are extracting much of your potential profits when you buy.

For a property like this, does the market there really sustain $3,100 rent, per month?