I won't argue 50% rule since it's only for people that buy for possible cash flow and not profit.  

Last time I bought one, they were $40 at HD and $30 at Lowes for a different looking one.In the cities that don't require one, I put in the small ABC type that HD sells for about $18.

I'm not hear to argue as I'm not speaking from theory, but from experience.

@Justin Moon Your argument is with the appraiser, I was just merely giving my opinion.Again you're still trying to argue the price per sq/ft without considering total price, which is my main point.  

I don't argue.  

The advantage McDonalds offers over college can be argued as well.

I believe @Marcus Curtis  is right on all he stated.From what I have read, Section 8 has been argued in court and the court determined that Section 8 money is not "income" so landlords are allowed to not accept it. 

In any case I don't think anyone would argue that if you put $100k in a brokerage account invested in SPY and left it for 10 years, that it would outperform managed rental properties.

If the Broker you are working for isn't collecting rent for ABC Realty, then you aren't allowed to collect for ABC Realty. 

To a lesser extent, did the repair cost 2000 bucks ( not really relevant, but you could argue it as a reason for non-payment if the first 2 questions are true) if you haven't paid it yet, don't.