I do think the two tend to have a loose correlation, but clearly every market is going to have its own dynamics.

Investors who invest OOS or work a 9-5 tend to go with Turnkeys as all of the work has been done for you.

There are defenses to liability for property owners whose property is impacted by contaminated groundwater from an off-site source so long as you exercise what is known as "reasonable care". (2) since you will be using this for self-storage, this will be considered a commercial, not residential use, and many states have less stringent standards for commercial properties since people are not occupying the property 24/7. (3) If the levels in the groundwater would pose a risk of vapor intrusion (vapors migrating up from groundwater), you can install a passive sub-slab depressurization system (ssds) that acts like a radon system-capturing the vapors before they can get into the structures.(4) if soil is contaminated and you plan to pave the surface, this will generally be sufficient remedy if the soil contamination is at depth.

I do know that both sides are cheap and tend to complain about deals.  

I don't recommend using Cut-Off-Riser, they tend to be weak, I prefer non-cut off riser.

They can also offer you knowledge & advice of area, general renter info & will advise you the crime factor of your property's neighborhood, so you have a better idea what you are getting into.Also residential rental tends to have more issues than a NET lease commercial tenant, so this may be a better investment choice for you.

Casinos tend to be very self-sufficient since people go there to gamble, drink, and spend the night.

Single family investment occupancy loans have a min 15% down payment per the Conventional guidelines (some lenders and banks may require 20% or 25%), and investment occupancy rates still tend to be under 5% for most scenarios so if your situation does not fit the second home box, the investment loan may not be too much of a stretch. 

Also, the Milwaukee market tends to be insulated from the vast ups and downs that other markets in thr country might experience.

As I'm sure you know the price range in this area can vary widely- for example Princeton may be tough to find a deal, but I've found the numbers tend to work much better in the Hamilton/Trenton area.