*OK, I understand the part about more poly's-vertices does not give a better texture, does not really even have anything to do with how detailed the texture is, I mean you can take one polygon with four vertices and put an entire bacground texture on it, that much I understand. However doesn't a larger texture map give better detail?

No more than 4000 x 4000.
 
BTW  Detailing with displacement process.  Paint your map at 8000 x 8000 then reduce to 4000 x 4000.  In Max go into Sub-D mode,  increase your poly count to 100,000 or more use your texture map as a mesh displacement map then bake the map. Export map,  greyscale it and use it in Poser either as a bump or displacement.