Sister's destination wedding affordability - Lemmy.ca

My sister is planning a destination wedding, and the total cost for my Wife and I to attend is $5,000 for just four nights. We simply cannot justify that expense. However, when I told her it was unaffordable for us, she pointed out that we are planning our own family vacation this year. Her argument? “you can’t afford my wedding next year but you can afford a vacation now?”. Am I the asshole for politely declining my sister’s wedding invite? A family vacation is not the same as forking out $$ to go to someone else’s wedding/honeymoon.