Housing for workers or even Airbnbs could be less lucrative but have less overhead because the tenants are self-sufficient.

The appraiser must provide a sufficient explanation of the basis and rationale for all adjustments (or, if necessary, lack of adjustments) within the appraisal report or addenda." 

You just need to hire sufficient help to retake possession, e.g. movers, locksmith, etc.Good luck.

Not to mention, for the transaction to make sense for a wholesaler, won't Mel be required to go under contract for less than the FMV in order for their to be sufficient spread for the wholesaler to assign the contract to the end buyer? 

If your retirement and investing goals are basic, a regular CPA should be sufficient. 

Michael Blank sells a course for $1997 that looks sufficient for getting your first deal done.

Like Dwayne mentioned, a FAR/BAR vacant land contract will likely be sufficient. 

Not worried about it, and the FDIC is there if something goes bad. in actually a little worried for you, if you have millions in rent collection per month, so you have sufficient FDIC coverage?

Should a house always have at least one tub or is a walk-in shower sufficient?

However if you plan on buying 3-4units, there is a trigger rule for FHA, it is called the self sufficiency test.