Just hiring a wedding photographer can average between 5 and 10 grand (and that's not to hire Annie Leibowitz).
I charge on the low end of that average and I'm "cheap".
This is without the price of the ring and honeymoon.
My source is personal experience, and that of my friends, but also see: http://www.costofwedding.com/
Where did we use the extra $$? Property.
(Obviously, I'm biased because of how me & Erin got married).
That's one of the bridal-industrial complex's best coups ever. (The entire notion of surprise engagements and diamond rings was pretty much created out of whole cloth by De Beers in the 1920s. See this excellent article by Atlantic Magazine -- one of the best pieces of journalism I've ever read, and as relevant today as when it was written nearly 30 years ago. http://www.theatlantic.com/magazine/archive/1982/02/have-you... )
My wife and I did catered turkey dinner at a church hall for 130 people. DJ was a guy who owed me a favor. Total cost was about $11k.
If you rent a more expensive place and do a barebones dinner, you're looking at $45/head + a couple grand for the hall, plus dress, band/dj, etc. It adds up!