Playing for cash flow still, but also a little for appreciation and the single families typically dont require as much hands on work on a weekly basis (mowing grass, shoveling snow, etc.)Everybodys niche will be a little different.  

People watch youtube or HGTV every day and instantly declare themselves an investor.

These are some of the questions you have to ask on a case-by-case basis.

My wife and I both have full time jobs, take care of our 2 boys and I have spent almost every day off for the last 8 mo working on this house.

Worst because you really need to have an experienced expert or specialist to walk you through the regulatory environment, as it can vary on a county, city, or even neighborhood basis!

There would be or can be if I advise on an individual basis in a specific note, I'm not willing to take $500 on payments or charge a % of some profit and take on that liability, that won't even cover my insurance premium.

Spend 5 min everyday to reconcile transactions to schedule E Categories and upload receipts.

I began everyday listening to BP podcasts before I went to the gym (exercise is a great way to push out the naysayers).

When I die, they can keep renting out the properties or move into the SFH, or take the step up basis and sell it with not as high of a capital gains tax hit (I hope they wouldn't choose the 3rd option).

This is a case by case basis, but back to Warren Buffet's saying: invest in what you know.