You always also need to keep enough of a cash cushion to survive the (all to frequent) black swan events. 

Black be its fall!

Purchase price: $265,000 Cash invested: $75,000 Sale price: $400,000 Brightly reimagined raised‑ranch on a private wooded corner lot, featuring crisp white‑brick with bold black trim and a welcoming screened porch.

😒Fair enough...In that case, I drive a black, 4 door vehicle built in 2016. 

The other scalability problem with STR is that each unit has its own mortgage, insurance policy, a property tax bill, outdoor areas requiring maintenance, HVACs that go out and cost a fortune, and many other potential expenses and time black holes that are specific and exclusive to each unit you own. 

With accredited, it’s black-and-white: you need a certain income or net worth.

Purchase price: $265,000 Cash invested: $75,000 Sale price: $400,000 Smart curb appeal in white brick with bold TriCorn black accents welcomes you to this beautifully reimagined raised ranch.

@Hoai Nguyen There's really no black and white answer because it depends on your financial position. 

I think you know this but for others books on risk like "Black Swan" or "Fooled by Randomness" by Nassim Taleb are excellent reads.

If I am reading this right you are still in the black for profit, all in $277,500, and with sales fees if not added $18,750... $296,250..