I don't live on IRR or even GRM, I live on T12/IE report, Mortgage terms ....Area reports and instincts which have never failed me. 

If you fail to follow the rules, you may open your personal assets to a lawsuit.

-Do you see a common vein in why people might fail in real estate investing?

I'd rather make a mistake and fail knowing it was my doing than make a mistake and fail due to someone else's doing.How long have you been in the business?

But others, may be a lot more if a furnace or ac unit fails and you have to get 3 bids and meet contractors at the property, etc.Even if you hire a PMC, you need to spend a few hours monthly "managing the manager" and responding to questions and approval requests.

I prefer to operate on stretch goals, my background is in tech startup sales so I love to hustle and I'd rather fail at getting to 500k and get to 350K, than shoot for $300k and work less smart/efficiently or only get to $250k.

Once in a Solo401k IRA money can be transferred and converted into the Roth portion of the Solo401k.Your seed and crop analogy fails to grasp the fact that paying taxes upfront on a conversion to a Roth gives many multitudes greater returns than RE held in a taxable account or an IRA.Using a STVR as an example. 

A couple years back there was a ballot measure to try to remove Prop 13 for commercial properties, but it failed (but be wary of it coming up again). 

I have heard that most cabins are failing inspection, but it is for easily fixable items like no exit map on each level or the charcoal grill being too close to the house etc.

It's highly unlikely the seller will agree to sell for what it failed to sell for in 2019, even with the remuddling fiasco aside.