It isn't always an economic thing though is it Mutts?
If you work in somwhere where lots of people have school age kids, chances are you aren't always going to be able to have the holidays that fall out of term time.
I've had to take all sorts of less than ideal holiday dates because of the way my OHs leave works and the job he does. I'm pretty sure parents aren't immune to that
Interestingly, neither of the parents I saw interviewed on the new this morning cited economic reasons. One had a child with cerebral palsy who wanted to take her son to a place that had special facilities for him. It was booked up during the school holidays so she requested to be able to take him towards the end of term. The school refused.
Another bloke had been unable to book leave during the holidays for 4 years running. When the same thing happened on the 5th year he took his kids away during term time and accepted the fine he was given.