This is said a LOT and I'm never clear on how anyone can make such a statement without detailed knowledge of the specific LDS providing the training.
I certainly can say for a fact that MANY LDS's make a LOT of $$$ on training. Do the math:
OW Class $150 per student. That includes NO materials. 100% gross profit. They pay the Instructor maybe $25 per student.
Materials $65, and likely a 50% gross profit margin.
Our LDS does two or more of these EVERY week with generally 8~10 students.
At 8 students that's a gross profit of at around $2400 weekly not counting profit on the materials, and retail goods the students purchase.
Now add in an additional $150 (local)~ $200 for OW checkout dives. Here the may have travel expenses (hence the difference in local vs. travel fee's). However they often show up with 25+ students for a weekend. Even at $150 per student that is another $3750 in gross profit, and they do this about once a month. At the $200 rate it's $5000, and the travel expenses to put up 3~4 instructors does NOT run them the difference ($1250).