Ok I am clearly an exception to the 'norm':-
1/ Every item of clothing I wear including my 1mm booties goes into the washing machine when I get home for a gentle cycle, even when kiting for days in a row.
2/ My harness gets rinsed with fresh water every wear and because I leave my safety leash attached to my harness I also ensure to give it a rinse, pull it apart and reconnect ready for my next session (always check it before puting the kite in the air as well)
3/ My board gets rinsed
4/ Kites, only get rinsed when the salt build up is disgusting and crusty then they get a fresh water hose down and left up inside my unit to dry overnight. They are never put away wet even when salty, always ensure that they are dry.
5/ Bars/lines - rinsed and left on the laundry tub to dry, ensure that I pull the chicken loop out so that I can rinse any sand that has been caught up to ensure that if and when I need it, it's not jammed up.
Does it make a difference? Don't know but to be honest my gear is holding up well and with regard to point 5 and 2 (leash), I won't comprimise on this because I want to know that my safety is going to work when I need it.