I like a light bow. It's one of the biggest reasons I sold my Apex series Mathews bows and now have the Constitution. For me, a good neutral balance of the bow (left/right - front/back) is VERY important to me. Also it is important to fine tune my holding pattern by having a perfect mix of the bows mass weight as compared to holding weight at full draw. A light bow allows me to fine tune these things the way I want them, rather than dealing with the weight that came on the bow from the factory. This is VERY important in my opinion.

Add in to this fact that weight is usually best when added furthest away from the bows center, and now it makes a lot of sense. Now you can add the weight at the ends of the stabilizers rather than have it on the actual bow.