I mis-spoke, I was simply try to say that an investor can borrow from their own sources to get the benefits of leverage without having to cosign a loan for a larger amount that will negatively impact their net worth.

Force you to get someone with skills that exceed your wildest budgets.

or is me having too many home loans impact me negatively to qualify for extra loans?

Than i seized the day, I tried out furnished rentals on two of our houses (HUGE impact on why we are successful) and so successful we will be doing it to 2 more houses), raised rents during natural tenant turn over (from 1250 to 1450), and so on. 

He can force anyone that has an expired lease to sign his or move.

If that never corrects, and I see that as an extremely difficult correction to occur unless and until money becomes more expensive and difficult to attain, rehabbers and flippers will be forced to vertically integrate and market to find their own deals unless they can team with wholesalers that sell with pricing using a long term view knowing they can not have repeat customers unless they leave enough meat on the bone for the rehabber/flipper to make a profit commensurate with the risk and financial investment involved. 

If something beyond your control comes up forcing you to move out, like mom who lives in another state coming down with brain cancer or a forced job relocation, you can move out before 12 months.

Note Force Academy

(unless it's vacant, then I am forced to do that).Is this what most others are doing?

I'd also encourage you to focus on a really small area, so you can have more of an impact on the neighborhood.