Would a low enough sales price make all of my concerns go away?

The BEST method for real estate investing is very simple: increase earnings, reduce expenditures, save, and invest from your own funds.You should focus on increasing earnings and learning how to manage your budget.

Should they be concern?

It’s all BS.If AI truly worked, there’d be no need for DMM, D4$, cold calling, or any of these other methods.

Perhaps valid concerns.

Many would suggest against RE investing using retirement money but if you go into low risk opportunities it can be a powerful diversification method.

It seems like anyone can post anything without accountability—very concerning.  

These methods involve securing financing, identifying suitable properties, and overseeing renovations.

I am surprised that @Noah Wrights clients aren't as concerned with that.

This depends on if you are using the Cash or Accrual method of accounting for tax purposes.