Our marriage/wedding cost $345. 4 people were there. $200 dress (she looked incredible, I will never forget seeing her in it for the first time). My tailored suit that I've had for a couple years. 4 friends, so 6 $20 tickets to the top of a mountain. $25 for the license. We had a private mountain top wedding. No hassle. Great pictures, and I'm just as married to the love of my life as I would have been if I had spend $45k (like one of my friends did not so long ago).
Pre-nups. I'm not into them. If you're not ungodly rich already and making sure they aren't just marrying you for your assets, they seem like they would get in the way of the marriage. Yes, I make 4x what my wife does. No, I don't feel the need to protect my assets from her. Maybe I'm young, stupid, and trusting, but I think this will last.
All that being said...
We did have another ceremony that family was invited to. Family paid for it too. We spent about 1/3 of what they gave us for the most extravagant, outlandish ceremony and party we could conceive, still coming in barely over $5k. Seriously, it was the most legendary wedding I've ever been to, and everyone (well, except for a couple people who are just always cranky) had an amazing time at the reception. Venue was the biggest cost, but it was worth it. Breakdown of what we did to cut costs for this one
No DJ. --They are usually terrible, don't play your music, and think they're allowed to talk all night. Nope.
Cash bar. --We didn't want people getting trashed at our wedding. We bought the first round, then if people wanted more, it was on them
Food --Nice appetizers were passed, made everyone feel fancy. Then buffet style pasta and sliders. Cut the food cost in half, and was still my favorite food at a wedding ever
Cake --Cupcakes. 100 of them was 1/4 the cost of a regular wedding cake and people still felt fancy
No wedding planner --They don't listen, are usually awful people, and cost a lot. So a little extra work and we had everything the way we wanted
Flowers --we made the center pieces ourselves. People argued over who got to take them home, so apparently they turned out well. no other flowers
Honeymoon --we went outside. Visited some beautiful places. Way better than staying drunk at a crappy resort on a tiny piece of littered beach