On the surface it seems that everything on the market is wildly overpriced but there must be deals out there somewhere.

(Not in order)1) Check and Replace Smoke Alarms every 6 months2) No 100 Watt Light Blubs allowed3) No Daisy Chain of surge protectors, max of 6 items per wall outlet which has usually has two.4) Keep candles in a sturdy holder on a level surface, away from combustible materials and out of the reach of children or pets.

Some of the conditions for example would be:Missing smoke detectorsUnstrapped water heaters vulnerable to earthquakeMissing handrails where they need to beCracked or damaged exit doors that are being utilizedCracked window glass or floorsPlumbing leaksAsbestos Rotten countertopsTrip hazardsDefective surface paintJust to name some of the few, I'm certain there are many more.

On the surface, I would agree that we get paid more when there is turnover, so therefore, we must enjoy turnover.  

It seems like it should be a good flooring option for an income property, but are there concerns with it coming back up since it is not a glue down surface?

I too have higher end rentals with that price range but I have been installing laminate flooring because they offer tougher surfaces than wood flooring.

Would you install tile immediately following foundation repair or use a more flexible flooring surface (assume the area to be tiled was subject to the foundation repair)?

I believe it is some sort of powder substance that they coat surfaces with.

Seems like the first installation method that requires no adhesive and the claim that "planks are extremely flexible and self-level above the substrate to create a flat surface, even over imperfect subfloors, making for an exceptionally easy installation" could be an issue when the subfloor is not level. 

While I would have liked to partner with them, it wouldn't have worked out because one or more of those issues above would likely have surfaced.