Not just as Sqn Cdr.
When I was cadet and then CI, I spent hours (all pre widely used PC software) putting lessons together on acetates, hand typing / drawing handouts and even after this and using software all takes time, which can be looked at in financial terms.
In the modern era H&S, TO, Adj can spend hours doing things away from the sqn to placate the salaried staff's requirement for bits of paper etc and not to mention all staff prepping lessons / activities. How many of our employer's hours could be billed to HQAC? The odd 5 mins here and there dealing with ATC things soon builds up.
If you were to say that an average hourly rate for volunteer staff was say £12/hr, it could easily equate to c. £80/week (c. £4.1K pa) per member of staff for things away from the sqn. Of course this is very simplistic but putting a monetary value against it makes it more real. If you add in time at the sqn add another 5/6 hours a week, taking it to c. £150/wk.