They are noisy, have verbal altercations (and there was one physical altercation involving a third party), have smoked in my unit despite it being a non-smoking property and do not maintain the grounds as they should.

It's virtually impossible to buy physical precious metals (for delivery) anywhere for any reasonable price. look at pretty much any asset.

I've had my own Architectural Firm for over 40 years specializing in energy efficient, cost effective homes, I was the only guest speaker for a national training seminar teaching homeowners how to design and build an energy efficient home, I've been managing construction for more than 40 years (one way or another), and I put myself through college working in the field physically doing everything you need to be able to do to build anything.What do you want to chat about?

I have a colleague that rented his MTR to a traveling physical therapist and another friend who was contacted by an insurance agent to rent out their MTR to a family displaced because their house burnt down.

Are these physical forms of advertisement still effective or is there a better method of reaching the masses?

Sometimes 2-3X longer than a traditional residential acquisition/sale- Less control of the property/asset-- you do not own the physical RE.

But do keep a physical key in the lockbox as a backup.

I made $100k buying two lots sight unseen and selling them and never physically went to those properties lol.  

Since there is built up interest via equity build up and [possible] physical improvements of the property, although technically one can simply evict the tenant, for all practical purposes a judge might consider the tenant-buyer's interest in the property and require a foreclosure instead of a simple eviction.

Risk of economic changes in your area, Physical risks of loss, insured coverage.