Having roommates can be irritating, but as you said duplexes are more difficult to find in most markets. 

And irritate the construction unions?!

I’ve seen landlords successfully sued for large amounts due to refusing to remove dead trees resulting in injury; not complying with swimming pool enclosure laws; having window frames in such bad condition that window ac units fell out; refusing to disclose existence of toxic mold; not eradicating lead paint; and many more.  

Those companies ALWAYS make it a big deal. 99% of mold is non-toxic and unless they are "huffing" the material, they will be just fine. 

I’d rather not encounter a toxic tenant who may destroy my property and spew verbal sewage to my other tenants.

We don't know what states the properties reside.Florida, Georgia, Hawaii, Illinois, Indiana, Montana, South Dakota, Virginia have different laws.Oh, and by the way, an attestation to the insurer and others (mortgagee) will not change premiums nor constitute a “sale.”There are considerations such as the loss of asset protection after judgment (beneficial interest is personal property, not real property), but if the property is clear of a mortgage and the concern is title theft (a concern you raised), then putting the property into a land trust is probably a lower cost alternative to maintaining a debt (which irritates the wife). 

I had multiple FIVRR folks do work but a lot of them will create back links on sites with high toxicity scores so it actually ends up hurting you.

The more you want to deal with this the more irritating you will have.

Interest rates could be 50% right now, but if we are getting a 20% IRR it doesnt matter.Real estate prices have increased considerably in recent years due to low interest rates.

Other expenses that I've incurred are 2 1/2 months worth of credit monitoring through Score Sense at $40 per bill and a 23% APR personal loan of $2,800 to absorb a balance that I already owe on another credit card which was at a 0% introductory APR for another 6 months so now I have toxic debt thanks to their underwriters.