Bath fans sometimes vent into the attic if there is even bath fans. 

The water has been shut off and the immediate flooding mitigated by installing dehumidifiers and fans.

I've been a big fan of Plymouth County for a long time. 

Or something like 1% of our revenue for each new property (I like rev share to incentivize keeping the owner's happy beyond initial sale, e.g. not a fan of just having idea #1).

I'm not a big fan of buying out of state unless you really have to, and you can scale a lot more easily in one area than many, so I would focus on a single market until you've grown large enough that there just isn't enough inventory in your own market.

I’ve found better quality hoods, fans, and lighting fixtures cheaper than the big stores or than my contractor can find them.

Of course I'm a fan of the South, but since the people you work with will be most important, I would maybe drill down to a couple different markets (even in diff states) where you see numbers that meet your needs and then switch to focusing on people, let those choices pick the market for you.

I am not a huge fan of non purpose built properties, but I understand why someone would buy a house with a coach house.

I am not that huge of a fan of condo's. 

Any fan of the podcast knows what I mean when I say houshacking I’m sure.