How long can a bakery survive without charging for cakes, or a shoe shop without charging for shoes?
Quite frankly, it’s a wonder that Watchtower has managed to survive as long as it has!
Round and round we go.... as noted many times before, The wt was never a publishing house in the traditional sense. They simply use the publications as a means to separate the flock from their money. They have always been a religion with their members as their source of income. As long as they have members they have “shoes to sell”, to use your flawed analogy.
Also, you admit to being supprised they have lasted this long.... at what point do you realize your assumptions are clearly flawed?