I never understood why people would have a flip, boost the value by tens of thousands of dollars, then sell it as opposed to keeping the equity and putting a tenant in there. 

Use the slower months to refine your operations and marketing strategy to boost occupancy and revenue.

Buy your next property with all cash, fix it up with cash, and then do a cash-out refinance afterward.

@Steven Catudalthe 'no cash flow on a BRRRR' is typically just because you are boosting the ARV and then taking out the maximum amount you can on the refinance, often using a DSCR loan with a higher rate. 

Are you generally seeing cash flow positive deals from day 1?

Just adding pets alone really helped boost renting. 

There is the Experian Boost that adds monthly utility bills as credit and various apps and facebook groups.

Bought a triplex in 2011 with all cash in my retirement account.

Second to cash in the bank is HELOC cash because you can use it however you want (you just have to see it already in an account).

Or any amount of cash you take out from the exchange are considered to be profit.