S.R.
I'm much older and find these extravagant parties to be a HUGE waste of money.
I've been working for 38 years and my money is important to me, and if my husband said he wanted to go to Vegas and get drunk, gamble, go to stripclubs...I don't think I'd be too happy, but then again, I'm older.
I don't know if you work or are a stay at home mom. Or if you own a home or rent...but spending that kind of money out of obligation seems ridiculous to me.
Most guys think their wives don't want them to have fun without them, my beef was I never got to have fun, because my 1st husband was so busy having fun, and going out and I was stuck in the house with my 2 kids. I resented it after a while.
I think it is normal to feel as you do, but again most women are more responsible than their husbands. I don't have the answer for you but maybe he could scale the trip down to a weekend down the cape or something. Good Luck!!