We just got married in Vegas this February. Just my immediate family, her mom, and a great weened between us all. We insisted that our wedding not involve people outside the immediate family - we have / will celebrate with friends individually as we visit them and they visit us throughout our travels.
Wedding expenses: Chapel at the top of the Stratosphere on 107th floor, limo to and from lunch, elaborate lunch at Zefferino at the Venitian, photo ops at Caesar's, Bellagio, Venetian, and elaborate dinner with wine pairings at Top of the World restaurant on the 109th floor of Stratosphere.
Dress was $200, custom-made on jjshouse.com
I already owned my tux for ballroom dancing
My brother was the photographer - I own an SLR and a couple good lenses, and I rented a professional flash for the weekend.
Total cost for 7 people, including 2 rooms and 1 suite for 3 nights, and airfare for 4 from California (Fiancee's mom paid for her own ticket from Russia) - under $3000. That's 3K, not 30.
I'd say that was pretty mustachian.