Well when the Poulan Pro line was introduced, it was to put the pro saws in the hands of the stocking dealers only, thats why the change to yellow.
They were getting upset at the saws being sold in the box/farm stores etc.
As you can see with the Elux deal, things got switched around alot and Poulan ended up becoming a consumer only brand but they seemed to keep the Poulan Pro brand to be used where ever.
Thanks, Mark. I figured it might just be marketing but didn't understand the logic.