Applying ARV/Duplexes

[Damon Daoust]

Greetings!

I am at a loss. I have tried doing some research on the forums as to exactly how to use ARV, and I'm simply coming up with threads on how to calc ARV.

  I understand the core concept between getting your main property, and then 3-5 comps you adjust to reflect the apples to apples number, but what I'm failing to grasp is the why you adjust other properties to your focus property, and not the other way around?

Or, in more simple terms:  Now that I know what all the properties SHOULD cost if they were all the same property, what good does this do me?  One would assume you would try and adjust the property you want, to the costs of the ones in your market to see how much repair wiggle room you have to sell around the current (retail?) market value.