It also included taking time to physically drive by the property and checking out comps.

I've discussed this with a lawyer, I am able to evict based on my zero tolerance for criminal activity addendum, but an eviction with a physically aggressive person doesn't sound like a great idea.

I had learned how to sell options, how to remodel my house, how  to day trade, how to start a self directed ira, I started a Physical Therapy clinic, mined bitcoin, made a few websites, I think I may have even learned how to raise chickens/honeybees/ and grow organic vegetables. 

Is this something that could bring value even if one of us is not seeing the physical property before an offer?

PM sounds like a jerk.. and your stuck defending someone you hired to do the best job possible for you.. they dropped the ball and you need to further monitor what they are up do and doing by physically taking action and checking what's up.  

When I am asked to stage 3 or more property's at a time, is it physically possible to do it. 

One major appeal is that real estate is a tangible asset that you can physically control as opposed to the the stock market where we have 0% influence on our investments.

This is not something you will understand without physically being in the neighborhood.

The second problem is that rental houses quickly physically depreciate with renters and have more maintenance issues than an average apartment.  

We are both physical therapists and we do not find it wise to have 100% of our income be reliant on being physically able to work (disability insurance can only provide so much comfort).