Yes do it.
The price is high, but getting a job at Qatar Airways is good. You'll get all the hours you need to get any job in the future, the salary is good and lots of other benefits from a large company like this. The price is high, yes. 155.000 used is al lot of money. But it's the same amount of money that it will cost you when getting a training in the UK. Only those guys will end up having 200 hours after two years in school and they can't get a job.