Take for example the PPL.
UK = £6k
US = £4.5K + flights + accommodation + time off work for 21 days. (Keep in mind the 21 day courses are taking up to and sometimes over twice as long)
Your forgetting about time scales though...
UK= God only knows
US= A month
4.5k would get you the licence and the accomm in most of the schools also.
On another point they are just the JAA schools in Florida not the US.