General Question on Attribute Requirements and Pricing

Is there any generalized guide on the value of attribute requirements for max gold items?

I have been quite mystified trying to figure it out. Any help would be much appreciated.

Obviously, higher requirements are not as desirable as lower reqs, but where are the price breakpoints, and for what items?

EDIT: if anyone wants to write a general guide that would be great. I don't have enough knowledge about the market to write it or I would try.

i dont think itd be possible to come up with a general guide, just know that (and i think this holds true at traders too)...that low reqs are going to give more money, and the biggest price decreases probably come between a 12 req and a 13, becuase after 12, you need runes

That's a Good Point(tm).

after 13 u need runes. head grear gives an attribute point.