Whenever a WT article is discussing putting secular work ahead of theocratic activities the accompanying photo is of a well dressed white collar worker sitting at desk/computer (the kind of job that typically requires a degree) pretty much 100% of the time. (Read: people who choose desk jobs are materialistic.)
http://www.watchtower.org/e/201001/article_02.htm
http://www.watchtower.org/e/200903/article_01.htm
http://www.watchtower.org/e/200706/article_01.htm
http://www.watchtower.org/e/20070101/article_01.htm
I don't know about your hall, but in every hall I've ever been in, the white collar workers all have 9-5 salaried jobs and paid vacation; it is the tradesmen that skip service/meetings for work.
"Oh, Br. Electrician would be here but he needed to get the wiring done before Br. Drywall can start."
"Br. Plumber can't make it today because he's stuck on a side job this weekend replacing a water heater."