Ok I know that I will pass for VGC's grammar nazi but I think you meant to say "Take this rumor with a grain of salt". not for a grain and certainly not for a "gain", that literally means nothing.
Sorry, these little things bother me, it's because of my OCD.
Yeah OCD can be a b***h.
But people just might get salty if this is true,so it might end up with a gain of salt ! ;)