Yes, they are dust collectors. However, they block the dust from just settling behind the couch. Most upgrades to coaches include going from partial valances and lambrequins to full ones, like ours. It is considered higher end. It also reduces the cheaper look of exposed window frames. If you've seen lower end coaches, they often have the short-legged variety and just don't look as "finished". BTAIM, your wife's opinion will trump if you want peace in the coach.
2003 Alpine 40FDTS (400HP)
Long Beach, CA