One thing I concern is, what if the HVAC and the refrigerator needs replacement part, will the replacement parts cost 10x higher price then what normal model charge? 

Anyone out there argus certified to help model a few properties we are looking to buy?

I personally am not a fan of the turnkey model (here or anywhere else) as I think it has some serious flaws (not to be rehashed here).  

If these don't match your model, figure out why.Verify the net income with tax returns.

With that being said, I created a Excel model and like to get your input if the fields  captured are accurate and my formula assumptions are correct. 

Their model did factor in the current 3% unemployment rate and housing supply.

Our business model is converting to automated 24hr access.

Using IRR will help model out the timing issues of when you realize your principal payments.

But they are real estate professionals, many with formal research and investigation backgrounds and all with million-dollar pockets, and casual here-today-gone-tomorrow looky-lookies are not going to compete successfully with them.The best advice I've ever heard about spending money at the auction went something like this: if you can't afford to drop the money you've budgeted to spend at the auction in a pile on the sidewalk and burn it right there, if your business model can't survive that, don't bid.Again, I would say a real estate auction is a great place to learn a lot about real estate by studying and watching, but it's not a place to learn by trial-and-error.Best of luck to you.

However, my full-time job in corporate strategy provides me three fundamental skills I believe will translate incredibly well to real estate:Quantitative analysis and model-building are core skills to being able to judge the value of a potential market / acquisition in my daily workMy daily success hinges on instilling efficient, scalable business processes and getting creative with incentive alignment to ensure everyone is working toward the same goalAs a strategist, my work on the above has zero bearing if I haven't earned the trust of those who must execute against them.