Going to join the bandwagon here and say:
Do not pay for line training
you will not get a good job afterwards
you are ruining pay and conditions for everyone
And on a separate note, picking up from earlier comments, I'd rather be well paid and bored than poorly paid and bored. I'd also rather do very little work and earn shed loads of money than work 100-120h a week and earn shed loads. A girl I
the other day is a corporate lawyer: her starting salary was USD160,000, and she's been working for her company for 3 years. So I'm guessing she takes home about GBP 180,000 a year. She lives in a sh*thole of a flat, and she says she's not bothered because she is never at home. She works around 120h a week and frequently gets called in on days off. We worked out that my hourly rate is more than hers...
... and I've never paid for a TR or line training.