Buzzdof
Any business needs "added value" to pay wages etc, and even loss making routes etc are added value, most businesses need this, but sooner or later if you fill up your business with loss making added value you are going to find it tough, this is why it doesn't matter diddly squat whether your planes are full or not, if the returns aren't there (I'm not saying they're not - yet) then times are going to be tough, this sentiment is true for any business / airline.
Good luck