say i get enough capital to do 2 100k homes a year. take that 4,000 and make it 8,000 a month of income.is there any other ways to sustain that kind of income with the with the way i would like to do it (2 bank accounts)?

You will incur greater financing costs but if you set up a system that is self sustaining then you will be better off in my opinion.  

A self-sustaining, functional, and community improving entity that allows me to not have a NEED to work.

If so, you may not be able to sustain a hotel rental as suggested by @Bjorn Ahlblad.

My second question is how to sustain my capital.

In previous purchases/refinances, I would just get an e-mail or a phone call from an appraiser who did a drive-by (if that).Though somewhat driven by investor-demand, I believe the current price increases are more-sustainable because there are more factors that make it difficult for buyers to take out a loan on a property they really can't afford, or take out a loan with an LTV greater than 100%.

what not to do, and am now focusing on creating a sustainable real-estate portfolio that withstand the ebbs and flow of time.

You might also find or create lists of properties belonging to people who have inherited them in the last several years and do not occupy them, especially out of state owners.As always, lots of people post their intentions on these forums but few actually go to the point of taking any meaningful, sustained action like creating a list and nailing letters.

Therefore, we're working on making sure our rental properties are sustainable, in all senses of the word.

I'm looking to diversify, create a new revenue stream, and eventually build a self-sustaining empire.