I was serious. I myself have a handicapped sticker, always check the handicapped slots and always use one if any are available. I never see an empty space at the Wal-Marts in my area.
Maybe the problem is too many handicapped stickers in your area. ;)
Wal-Mart is very popular and the entire lot tends to be more full than other stores like Target, KMart, Sears, etc. So if they have the same lot size, and the same% of handicapped stalls, but the Wal-Mart lot is 80% full and the Target lot is 20% full then the handicapped stalls at Wal-Mart would fill up faster.