Newer ones (2008+) are suffering from seasonality now but will pick it up in Q3-Q4: if you look at historical data, Miami Dade county has always had seasonality low volumes during summer time, due to hurricane season, holidays and less tourists visiting. 

So what your not saying speaks volumes.

If one want's a safer place to play in that arena I'd suggest to follow the Oracle of Omaha and look into the transportation leg of O&G, more volume = more transport = more revenue = more profits.  100% correct, but wasn't expecting someone on an REI forum to come at energy like this.

But because there are some many it makes up way more than 10% of the volume.

Fast forward 2-3 years, about half of the properties I sold have come back around with the new owners trying to get out of them, some to no avail.Having said that, even though brokers looked at me like I had two heads when I told them we were underwriting an agency execution, someone besides myself must have been using agency debt because agency volume hit caps every year during that period.  

For the smaller stuff, I'd recommend 'The Multifamily Millionaire, Volume I' by Brandon Turner. 

Your move from Florida to invest in Columbus speaks volume about the potential in that market.

So while local wages are a factor in home prices, local buyers only account for ~14% of transaction volume.

Lowering prices on slower days can fill in the gaps, and it’s also worth setting longer minimum stays in advance to mitigate low booking volume over time.In my experience, mid-week travelers are usually on the road for work—client meetings, interviews, conferences, that sort of thing.

Profit can be achieved by volume and/or price.