This is of course just my opinion...but several of your discussion points like being able to lock the rate on a balance and obtaining a lower interest rate seem to overlook the substance that this is a revolving product so treat it like one.

Corporate revolvers have been drawn down on in hundreds of billions by firms just trying to weather the storm. 

@Jeffrey MasessaYou cam also consider going for 2 year to a community college and get a real estate degree it can help a lot with commercial real estate, but from what I heard in all the podcasts being a real estate agent or getting a degree in the field will just help you get a SMALL advance especially in cantract and connections, but you can make connections with a few good agents and use their connections and knowledge.

Much like @Ryan Williams, my big "why" and BHAG revolves around financial freedom and helping other achieve financial freedom themselves.I am fascinated by travel and learning how other cultures, and other human beings choose to live their lives.

The line of credit will still be treated as a revolving account.  

It's a revolving door business, which is incredibly difficult to manage without the proper systems/admin staff (which 95% of them don't have).2.)

I'm a new investor and for the last 3 years I've had a revolving door with tenants paying their rent.

So I paid off 19 rentals last year and none of it was caused by taking out a new revolving, variable credit line. 

Revolving optional.

It is a cam.