For instance, Fannie/Freddie don't have a prepayment penalty. 

It normally doesn't cost you any money to open and to be able to access that large amount of equity to buy or stabalize your current portfolio allows you so much more opportunity costs.For instance, I took a $200K LOC out on my primary residence when I first started in real estate.

For instance, there is a Lunch and Learn meeting the first Thursday of the month with the next one occurring Feb 6.

For instance, in places like Austin or Chicago, I’ve noticed similar deals pay off when you have the right property management systems dialed in.

In instance above if you put in 42000 and get 1200 a year - 1200 / 42000 = 2.8% Cash on cash

The rare instances they are caught there is no consequence.

The City of Portland, and Multnomah County are more restrictive than most of the state for instance. 

A well connected agent can also tap into their network.. for instance, probate attorneys might know of people seeking short-term solutions.

I understand I cannot legally require them to respond, unless the notice specifically requires it, like for instance, a notice of entry, but it's making it difficult to manage the property, and I'm not sure how to proceed.

Document clearly anything you do to screen the applicant and make sure you do the same for all similar instances.