It also requires gaining a level of sophistication and knowledge that not everyone has the time, inclination or ability to do.

(Mistake #3, not monitoring it myself or being a more sophisticated system.).

The file is limited on what it can do, and misses the mark on things like depreciation recapture or like-kind exchanges, which will impact returns, but it’s fairly sophisticated relative to what you can find out there or if you were doing it yourself with limited knowledge.

The reason you can generally only participate if you are accredited is because regulators know that it is easy to get taken in these deals and it is assumed (wrongly so IMO) that if you have a higher net worth and can plunk down a big chunk of cash that you have the sophistication to understand the investment. 

Sellers are sophisticated enough to pick the best offer, they only see the price and the terms, any other negotiating tactics are a waste of time.  

We pay them back at close.For people/teams that do something similar, I'm curious what software you use or spreadsheets you've created to: Track cash current cash flow and projected cash flow for the whole business that including fixed costs like payroll and variable costs as well.

Or that they’ll be able to use a highly sophisticated technique that can really only successfully be utilized when all the stars align and in circumstances that occur irregularly and need to be recognized as such, always by an experienced real estate investor.  

August 2024 payroll numbers continue to show a resilient job market, despite revisions expected to push the data higher, following a trend seen in previous years.

At that time I am not sophisticated enough.

You listed two but in broader terms financing (assumable, owner financed, sub to, fha, new 95% OO LTV that in most ways is superior to FHA, dscr, F/f conventional, NACA, VA, etc), value adds (development including ADU, upzoning, traditional rehab, sophisticated value adds that leverage localized rules, coop/tic, etc),  property types (residential, commercial residential, land, storage, MHP, industrial, office, camping, hotel/motel, etc), passive/active investment methods (GP, LP, REIT, nnn, self managed, pm, flipping, mineral right, lumber rights, etc), residential rent models (LTR, STR, MTR, rent by room, student housing, arbitrage, etc).