WT loves to brag about numbers, but really, when you look at "growth", as in baptisms, it's stagnant. So what does an "increase" in Pioneers really mean if the results remain unchanged?? If a secular company tripled or quadrupled its sales force, yet sales saw no increase, I don't think shareholders would see it as "growth"- they'd see it as a huge waste of effort and resources.
As pointed out, of the 277,000 baptisms last year it's fair to say at least half are children of JWs. Of the remaining half, a very small percentage can be attributed directly to the door-to-door work. So, 1.7 billion hours a year yields maybe a few thousand bonafide converts?? Dismal at best. At the last DC I attended the Bethel speaker was bragging about the last year's tremendous growth: 260,000 baptisms. The audience clapped in awe. I laughed, because few, if any JWs in the audience, realizes it wasn't too many years ago when there were 360,000 or more baptisms every year.