It's big business, if they can do it well and compete with the Turk prices i can't see why it wouldn't take off. Go on holiday and come back with a head of hair, although it would be half a head of hair if completely bald across the top.
Had mine done 5 years ago when i was working in Turkey, was collected in Istanbul in a private car, taken to hotel which was included in the price, had the 6/7 hour treatment, taken back to the hotel, collected in the morning and taken to departures for 1,350 Euros/£1,200. I convinced them to spread the 4,000 hairs evenly across the top of my head rather than the recommended 7,500 total,half now and half in 6 months that they wanted to do. Still all in place and a happy customer.
My friend had his done in the UK at the same time and paid 2 x £6,000 for both of his treatments.
No idea what it would cost now.