There was even one exceptionally kind Bigger Pockets member that seemed to know a lot about health and physical activity that we even chatted on the phone afterwards and he gave me some good pointers.  

I did one house I may end up taking a small loss on, we'll see.

You can expect turnover costs, losses due to vacancies, and other expenses.

A 50% decline in asset value would result in a $10,000 loss, double the loss of the unleveraged asset.  

Apparently, not only did they sell at a loss, I didn't get any money back at all and they claim I owe them an additional $40,000 for "renovations" despite no work being done to the building at all. 

Or is it just about scaling to something bigger?

Quote from @Kyle Carter: Hello Bigger Pockets Community!

When I asked him where he gets his deals from, he said wholesalers, word of mouth, and bigger pockets.

But you are required to file a Schedule E in the US every year showing the total rents you received, the expenses you had against those  rents and your subsequent profit or loss. 

The easiest way to find and connect with wholesalers is either bigger pockets or by googling "sell my house fast in (town name)" although that may cost them a click for google ads.