I've heard of folks using the equity in their rental properties to purchase additional properties and I'm trying to learn if this would make sense for me.

Smarty Pants(me), or it makes way more sense to them, and worth way more to them.Maybe they know if there is civil war gold buried there, and they just haven't had time to dig it up yet? 

The one I close on this week the numbers don't make sense to keep as a rental.

This way, you’ll get a sense of whether they know their market well and if they’re used to working with investors like you.

Makes sense.

Maybe where you live makes more sense STR or even long-term rentals.There are some places that MTR are more in the demand than others.

It is important that the house cash flow if you have to move for some reason.Does that make sense?

I know this might be hard to follow but hope it makes sense!

Then turn around and pull the money back out but be charged interest on top does not make sense. 

I’m not clear what it’s called but for instance like what I believe Grant Cardone does if that makes sense?