True enough. The field service hours are the bottom line to defining someone's spirituality, goodness, and worth in the org. (And money is a close second).
I know of two kind-hearted, truly "spiritual" young pioneer sisters who decided to incorporate into their ministry looking in on the elderly. Their idea was that they kept a list and systematically visited once a week with a hot meal and encouraging words and offered to do a chore or two. These elderly ones were truly touched and appreciative. In fact, one widow mentioned that she was visited by these sisters more than her only son (he was an elder in a neighboring congregation, 10 minute drive to mom's house).
As you might expect, a short time later the 2 pioneer sisters were reprimanded by the elders for "running a Meals on Wheels". No more looking after widows. Back to only recruiting for the org. I'm guessing the elder son from the other congregation had something to do with it.
So, yes, I wholeheartedly agree with the OPs observations.