Many Christian type religions, organized or not, believe in giving 10% like was done in the old days in the bible. You even have the Mormons, who must give 10%.
As money hungry as the WTS is, why have they not gone for that as well? They can always justify anything for any reason. Is it that they just have gone too long without it? It could be new light.
Not like the decision makers would have to pay any. It would not affect them.