Another issue is that the pool of properties you are going after is very small.  

Here is a list of exclusions of most insurers:Mold, lead, intentional acts, discrimination, statutory violations, rent abatement, diving boards and slides on swimming pools and finally attorneys fees are the most common.

There's also an annual membership fee to the pool in the community of $1200.

Hey guys!I was a Airbnb property manager for the last year (rented 6 houses, sublet them on the website), but as the goverment raised the taxes six times, I decided to sublet those houses to international students mak...

For the rest, you have to have the cash ready to go, which could be pooled from investors or cash from a business.

Just remember that risk and reward are inextricably linked and that the market won't always be blue-sky-sunny-day.  

@Warren Lanza the short answer is that there's a limited buyer pool.

Hey, I'd be happy to see Denver sunny skiing pics anytime. 

I am now a grumpy old landlady who can't seem to keep up with this ever growing pool of undesirable tenants who know too much!

I would raise the asking price just enough to weed out a good chunk of people but still have a pool of tenants who meet your criteria.