Traditional Crowns vs. Comfort Curve

Why does it seem that traditional crowns are more preferred over the comfort curve crowns to the point of changing perfectly good/new comfort curve crowns for extra cost after-market traditionals?
The World of Percussions
http://www.mycongaplace.com/forum/eng/
http://www.mycongaplace.com/forum/eng/viewtopic.php?f=14&t=9155
burke wrote:Although I've never re skinned comfort curve myself I think I've read its more difficult than traditional rims.