In seven years of school I've only taken my DC out for one day (barring illness), and that was because we won tickets to a theme park.
No one I know takes their DC out of school.
My DC have never been abroad, well once when they were babies, but we holiday in the UK in school holidays as our budget allows. They haven't suffered for it.
If it's abut YOU having a break, why don't you go away with some friends while DH has the week off with the children? DH and I do this at least once a year each and it's a fab way of cheaply recharging the old batteries. A few years ago I went to Paris for the week, DH is off to Scotaland to see friends, we were lucky enough to both go to Dublin a while ago while my Mum had the DC to stay.
My DC go away with Scouts twice a year (in holidays, and costs are minimal), and we do lots and lots of day trips at the weekends.
We are off to Center Parcs in a few weeks, sharing a cabin with my parents, it cost £700. Last year we went to Cornwall en masse, in a beautiful farmhouse: £900. The year before last we rented a lovely house on the IoW for £900 for the week.
Next year we're going to Disneyland Paris in August which at £2k is twice our usual budget but will be wonderful.
It's not insurmountable to take your DC away in the holidays but you do have to be creative, and perhaps not have a holiday every year.
You've been in for a bit of a pasting here, but really it's because we're all in the same boat and holidays are not an essential. But I do understand your frustration, although while I think it's disgusting that they hike the prices the way they do you have to see that it's the way capitalism works and is unlikely to change.