I think a lot of folks just buy whatever the local store sells and most local stores don't carry a good selection of flats because folks don't ask for'm - so . . . . flats are something a lot of folks are missing. Also flats last so long stores don't have much repeat business for folks buying flats. (online is another thing but I still see a lot of folks scared to buy online so they buy local where the selection is poor) I live in Nashville, TN so you'd think there would be a good selection of strings to choose from around here but it ain't so. Corner Music has as good or better a selection of bass strings as anybody in town but they still have rounds 10 to 1 over flats. (I hear the Low End (Murfreesboro, 20 miles from Nashville) is a good store but I have not been there in over a year) In the past year I've only seen 3 sets of 5 string flats in stores in Nashville and they were asking almost full retail for them.