More costly, but infinitely faster/more competent. 

In some cases you may have technically infinite rate of return if you have no money in the deal. 

the advantage to buying "below market" is the possibility to refinance all your money out of the property and have an infinite return.  

I do think these guys will be able to buy it in time and I've loved them as tenants but my kindness isn't infinite :)

The advantage Podio has over say Highrise, Salesforce, Top Performer etc... is the fact that it is basically infinitely customisable from its setup, lead capturing, integrations with other platforms, and automated workflows

I've had "Think and Grow Rich" on my shelf for a long time but haven't read it yet.

Towards the end of winter break, I was getting kinda bored, and noticed a book on my shelf that I had bought a year or two earlier but never read.

This changes as the mortgage gets paid down or appreciation increases the value of the property.Other less professional investors will usually ignore equity and appreciation in order to create artificial cash flow and ROI returns higher than they actually are.In your example they will likley suggest your ROI is infinite and your positive cash flow is actually $250 higher than it really is.

Last year at this time my rentals were flying off the shelf.

Provided that each refi @ 70-75% ARV still leaves you with positive cash flow on each rental, THAT'S the concept of "infinite returns"!