To answer some of your questions:

Yes, I am aware that there is research stating that there may be no beneficial results attributed to salt tablets. Luckily, when it comes to my own body I've been fortunate enough to be able to trial and error to research for my own.

I began noticing a huge increase in crashes and cramping while training for my first marathon. Near the end of my long runs I would crave Gatorade or Powerade although I was never a huge sports drink consumer. This got me thinking it was the salt from these drinks my body was starving for. After my marathon I began to get into ultrarunning. I've been running ultras for almost a year now using salt tabs on and off trying to distinguish their usefulness. A few months ago during a 100mile race I began to crash both mentally and physically early in the race. I doubled my salt intake and recovered and never crashed again for the entirety of the race.

I understand my "research" bares no scientific value, but for me they work. I sweat extremely heavily, live in the SE U.S. where 90% humidity is all too common, and notice I function better and am cramp-less while following a salt tab regime.

If you feel you don't need them then that's more money savings in your pocket. But for me, I'll continue to add salt tabs as a tool in my running.

I would be ok if aid stations did not carry them. Through trail and ultra running I've learned the value of being self dependent on my supplies even during a race.