I'm not at all sure about hanging my basses on wall hangers or best storing them in cases any more. I have kept two cheapie 'go to' guitars on the wall for a couple of years and my other two giggers in their cases. Lately, the two on the wall have both developed the dreaded 'ski jump' at the last frets above the neck joint even though they're never in direct sunlight or near a radiator. The radiator in the 'music room' is only half on at this time of year to keep all the gear from getting cold a
Being the sort of person that sits and thinks about this sort of crap, I'd say yes, although so small it's negligible.
The strings are constantly trying to pull the head and bridge together. If a bass is stood on something, stand, floor whatever, then the bottom is supported and gravity will help the head move towards the bridge under string tension. If the bass is hung then the head is supported and gravity (the weight of the body) will help resist the pull of the strings.
Very basi