I personally can't afford foreign holidays in the school holidays.
We are definitely not poor. Dp and I both work - we are one of the "middle income" families. We have one child, one (old) car, don't smoke or drink, have a 2 bed flat, no sky etc.
Obviously lots of people with school age kids do go abroad in school hols, otherwise the prices wouldn't be so high - but how? How much do you have to earn to manage to pay to go abroad in the summer hols? And how much does it really cost for a 2 week break...or even for one week?