So basically you are just rewording exactly what I wrote. If I have a 50% chance of winning and I am invested 10BTC. And the raise is .5BTC You are damn right I am calling. If you fold you are an idiot.
You went the other way saying if you have 20% odds with 50% profit return, then you will stay.
In your example it seems that you are giving more attention to your winning chances. I was just trying to say that I don't care about the winning chances alone. They could just be 20% or 1%, if comparing the pot odds with the winning odds proves to be a profitable play in the long run I will take it, even if I will probably lose that hand, because the winning odds are low.
The problem with most players is that they only look to winning odds most of the time.