The last charity even I went to WD40 actually had a booth. They apparently have a bike specific lube. I suspect it is a different formulation that the original WD40, which is good for freeing seized stuff, but was never intended to be a lubricant. It was originally marketed as a metal preservative. Spray it on bare metal, the solvent evaporates and leaves a film that protects it from moisture. Same thing happens if you try to use it as a GP lubricant.