To be honest, it would be incredibly unfair on the current BE guys and girls if the cadets were paid more than they were. It would certainly cause a fair deal of resentment - I think quite a lot of us accept that the BE salary is a bit on the low side, and it would not help to have guys coming through who are earning nearly twice as much and only staying in the airline for 2 years...
Loan repayments are possible on the BE salary though, it just means that life becomes really quite tight (I hear a couple of years of pasta for dinner!!) But £81,000 of loan is a very significant amount to pay off. I don't envy that one...