Litebulbs,
If you are already earning market rate plus 50%+, why would market rate plus 10% look attractive? Even Bill Francis has said that he wouldn't envisage MF being attractive to many existing BA cabin crew. It only makes sense if you are very junior and are able to fast track yourself straight to CSM. That's exactly what's happened.
As for rumours of it being difficult to recruit from outside at the rates being offered? Who knows if it's true, but as a previous posted noted, if it's not possible to attract enough of the right people at the current rates and T&Cs, then they WILL improve. Simple economics of supply and demand. I think BA already knows this and they are just seeing if they can achieve what they want to achieve on the base level they started with (and expected to have been negociated up from, had there been representation).
If it's true they can't get enough people, you will see the salary go up. If it's rumour control doing it's usual, then you won't. Watch and wait.