US Airways Flight Attendants Hawking Credit Cards

To and from my vacation in Grand Cayman I was on 4 different US Air flights where the flight attendants were pushing their airlines credit card.   Right after the safety briefing they went into the virtues of the card.   They then went up and down the aisles flashing the applications and taking them back from those who bought into the idea that they needed just one more card.   I wonder if  the flight attendant gets any kick back from the cards?

On the flight from Grand Cayman to Charlotte they actually referred to that flight at potentially being free next time if they get and use the card – they would have enough miles to go to GC from just one purchase.

I am sure this is a sweet deal for US Airways but do we need them pushing credit cards to people who are already maxed out on credit card debt already?