Cost of wedding dress?

So I'm watching "yes to the dress" (a program about brides who are tryin to find a dress do thier wedding) and some of the women on here are spending like £25,000!! That's like a house for some people. Not that I wouldn't do it my self if I had the money haha
My wedding dress cost me only £100 and that was 6 years ago. 
So how much was your gown/dress?