So simple to keep your seat post from sliding by just using a little bit of this. So simple and effective. I think it will last me 35 years based on how little you actually need each time. Maybe you should consider chipping in with a few friends to buy a single tube to share. But it's not that expensive either so it will last. :)
I mainly use this to grease the threads on my thru axles. So far seems to be working great. Only issue is the nozzle has to be cut when first used. Make sure you only cut a small amount off or you will have a ton of grease in your cap. Seems to be lasting a while and doesn't wash off easily which is good.