The cost of employment is about 20% more than the salary. 600 hours commercial instruction a year in UK weather is working reasonably hard. £60/hour charge would equate to £30K per annum for the instructor and NOTHING for the FTO! Now if you'd like to be taught by someone who is capable of earning only £12K a year, by all means go to the USA. Your instructor will be someone who has just completed his or her own training, delivered by someone who has just.....
Now maybe people will understand why the airlines choose to employ people who have trained at an FTO who employ professional commercial instructors. You can have the cheapest training or the best, but not both.