After that, your $1000 will probably be exhausted.  

What if two years from now they go up to the attic and notice an exhaust fan that terminated in the attic and not vented outside, or they wanted to add a receptacle somewhere and hired an electrician, and the electrician told them they can't and because the junction box has too many conductors in it and it exceeds the box fill capacity, so they have to pay to open the wall for a bigger, deeper box or piggy back another box...do they send you the bill too?

Again, this list is not exhaustive and by no means do these things mean you should not buy an investment.  

We spent several years being exhausted but it worked and now we are self-employed.

Here is a bit more exhaustive article from Barron's which sheds a little more light on this so-called expert! 

Make it easy.This is not exhaustive, but was curious for those who have gone down this path what else you may have learned so we can continue the education process for others.  

Once you have an FHA loan you are not allowed to have another FHA loan unless relocating a great distance for work.Now that you have exhausted your Low Down Payment Options (Portfolio Conventional and FHA Conventional and FHA) you will need to use a Standard Conventional Loan and put 20% down to get your 3rd Duplex.The sky is the limit...you could continue to buy properties and build an empire or just stop there and enjoy more free time...I have friend who quit his job and just manages his properties now.Keep in mind that this 4 step process I outlined takes time (anywhere from 1 to 10yrs depending on the person) so keep the big picture in mind but don't let it stress you out too much.

They smaller houses have two chimneys, connect the exhaust there. 

thanks for the response it does sound exhausting having 10 LLC for each of your 10 properties.

That said, we don't need to imagine that any of the requirements are infact insurmountable or exhaustive.