Idk, most of the more memorable I have attended were maybe a few grand. Mostly for the venue and bar, with friends and family helping out. The impersonal 100k affairs are embarrasing to attend pesrsonally. I have friends still eatig ramen, living in debt, and fighting bitterly over finances thanks to a 'dream wedding' that a majority of their actual friends couldn't even afford to attend. To call it depressing is to undersell the effect in my eyes.
The point of a wedding is to publicly (and legally) commit yourselves to each other - to tell yourselves, and everybody else, that you are now off limits for everyone except each other. Everything else is fluff, and the fluff disappears.
I've been married for 28 years. Much of the fluff is gone. The wedding cake is long gone. The developer lost our honeymoon pictures (28 years ago was still in the era of film cameras). The building we got married in has been torn down. I lost my wedding ring. But our marriage is still here.