The reality of today's life is that nearly every good job requires a higher education. Even those in the service and trade sectors usually need further schooling to keep up with the advancements. There is no shame in cleaning and maintenance work. And many hard working people have no choice but to follow this course. But it has limited opportunities to earn the income that is required to raise a family today. Unlike years ago, men and woman could find decent jobs with good benefits as blue collar workers. But times have changed. Most of those jobs have gone overseas.
The Watchtower leaders have no compunctions to use members who have educations. Doctors, lawyers, computer experts, etc. are all called upon to render service when needed. And they are glad to have their expertise. So, there is a certain amount of hypocrisy when they discourage other members from pursuing a course which will benefit their own stations in life. The leaders don't have to worry. Their needs are well covered by the generosity of others in the organization. One can not help but think of Jesus' words: "And you experts in the law, woe to you, because you load people down with burdens they can hardly carry, and you yourselves will not lift one finger to help them." (Luke 11:46)