As long as the milk of generous contributions flowed freely, the Pooh-Bahs of the Mother Church were utterly (or udderly) content to batten at the Old Faithful of the Church Treasurer's breast. A disturbing ebb in this largess no doubt prompted the search for a more reliable, or at least supplemental, breast upon which to feed, and the quest for a sure-fire business model (though probably not the once-seductive Planet Waves model) was born. But, O dear, how the blissfully nursing infant recoils from any carking cares. Far better the warm security of some readily available milk from the maternal breast of the Mother Church or a convenient cash cow than the awful specter of weaning, which a scientific demonstration of true supply through Christian Science would require.
No one doubts that it is, to human sense at least, extremely difficult to make a living as a practitioner, which is probably one reason so many have left their impecunious home-town labors for the big payout that beckons in Boston, even if it means enduring the rough-and-tumble of the scrum in the MC office which dispenses CSB's, lectureships, and the occasional lagnaippe of high office. The rush to these bestowals ignores one sad fact of these deeply materialistic times, that it is pretty much a zero-sum game if one is looking for "honest seekers for Truth". Even the most generously endowed sow has only so many dispensaries. The perceptible decline in recent years in the quality of practitioners, teachers, and lecturers is one byproduct of this growth in the ranks of mercenaries who "have gun, will travel" (at your not-inconsiderable expense). It is also quite likely that the once careful, if not rigorous, vetting process for primary class pupils is as much a thing of the past as Bill Clinton's chastity. A mirror beneath the nostrils is probably sufficient for some teachers in our desperate times. Supply now seems to be routinely "demonstrated" in the pockets of the bamboozled, blandished, and befuddled.
Christ and Christian Science demand that each adherent demonstrate it. I certainly include myself in that number who could do this a whole lot better, but I know of nothing in the teachings of Christ Jesus or Mary Baker Eddy which authorizes a hypocritical priestly caste which is entitled to nurse parasitically in perpetuity on the milk of others' kindnesses, however voluntarily those kindnesses were extracted, rather than vigorously and clearly demonstrating spiritually and scientifically what they ostensibly stand (and get well paid) for.