no reason except if you are chasing durability. under load the top guides have next to no pressure on them. i've seen a mate pop out a few single foot LSG's when using his rod to poke his lure off a snag (a no-no with graphite rods but we all do it!) so it may be best to use a locking wrap. I use either all single foots or a combination of double singles on all my bass baitcasters but use all double foots (albeit fuji titaniums) on my barra gear as i'm often a little rough on my gear when i'm barra fishing.