I cannot speak for "MOST PEOPLE" just myself.
The 3017 thread is not really an accurate representation of soap longevity. Most people there burn through soap as quickly as possible.
I suggest checking out the 3017 thread. There is lots of data on soap longevity.
Again, "Most people" there burn through soap as quickly as possible
Try "buttering" your bathroom mirror once or twice a week with the leftover lather. Seriously! Lather, then wipe off. It will keep your mirrors from fogging after a shower if the humidity is high.Even though I have enough soap to last many many years, if I have leftover lather, I squeeze it out of the brush and either plop it on top of the puck or in my lather bowl. I just can't bring myself to simply wash it down the drain.