For instance, I can tag @Russell Brazil by typing  in his name here.

It's also possible to have your taxes re-assessed in some instances; you'll need to look into local procedures, obviously.

For instance, you find a property that you want to purchase and they want $50K and it rents for $900/month.

In some instances they have equity based on market appreciation and in some cases they are underwater on the loan to value.After listening to a few podcasts I've heard of people buying entire portfolios from others who had planned on selling one at a time but were able to buy their entire portfolio at once. 

Normally, in instances like this I make my assumptions using Occam's Razor.Is this a common problem across the industry or did I just happen to run into an anomaly?

For instance if you are looking at homes in memphis TN or in Birmingham AL or Cleveland OH and you are paying 50-70k for a home then investors are going to be looking for 20-25% C/C returns, due to higher risks which i wont get into here.

For instance, some would flip it and you didn't even mention that.I will say this.  

I don't use it to value a property but I may consider in when picking a marker in general.For instance I have one out of state property that throws off cash with little to write off that income.

Use part of the reserves for a multi family deal,and part in the stock market like an index for instance.

It's the famous blame game.