I agree with Don on one thing, you are a dead set loser!
The Xmas party was organised by the ground staff of Flt Ops (people who earn much less than you), you know the clerical types whom you probably yell at all year because that makes you feel important.
These people have managed to pay $40 out of their pockets, (probably not as deep as yours), to invest in the spirit of Xmas and spread a bit of cheer. They extended the invitation to their customers (You! ********!) in the hope that they would come and share the festivities and break down a few barriers over a few beverages.
As a Flight Crew member I hope you don't turn up as no doubt you'll bring your miserable attitude with you and this is a fun night.
Over $100k a year and you complain about $40. Get a grip mate, or take your hand off it.
Due to work commitments I won't be able to attend but trust all will have a great evening in what is a great location. Rock it like Tuesday night
