(Sorry for the delayed response, wife had surgery a couple weeks ago and life has been crazy) You're a bit off on your assessment of what a cap rate measures.  

My Dad played one game for the Bruins until he got run into the boards and had to have surgery on his knee.  

It often requires rehabilitation or even plastic surgery, so the dollars associated with the insurance claims are higher.

I also retrofitted the bottom drainage as the original was just cheap plastic & began to leak.

I went next to the hospital to have a heart operation, and had to have brain surgery to repair a leak that tried to kill me too!

There are some cheap components on some like plastic sinks and faucets, Uber cheap cabinets and odd shaped doors.

Bandit signs - these are the 18" x 24" plastic signs you see on the side of the road.

Recently (last week)  i added door sweeps, weather strips to all exterior doors and door sweeps to all interior doors which needed them, bought them plastic to install over (new) windows. and have scheduled to get the furnace cleaned professionallyThe market rate of the apartment is 875 and i  am renting it to them for 800 should i be concerned that they are upset about high electric bills,  given i have done more than a slum lord to ensure they are happy and they are 75 dollars under market rat?  

So maybe I can just put some plastic between them and call it a day, but my fear is that in the future the copper could leak, which could result in thousands of dollars in damage depending on when it's finally noticed.

If I were to have heart surgery, I would interview several heart surgeons.If I wanted to have some one sell my house, i would interview several top agents.If I wanted to know the cost of a re hab,  ask someone that has done over 2700 flips andthat is the bets advice I can give anyone on here!