I mean hell the wedding invite card is going to require much more work/thought than this site, and it’ll be used even less (assuming the site is intended as an informational reference; the card will be used exactly once: to formally invite
1) The average middle class or upper middle class wedding is several hundred people
2) Vegetarian / Non vegetarian food preferences are helpful to estimate costs and convey to the caterer
3) Choice of alcohol preference is useful because you are only allowed to serve alcohol if you buy a permit and every bottle is tagged and photographed by the excise department in some cases. Most weddings do not serve alcohol, but those that do are usually helped by including a alcohol preference question.
4) Destination weddings are increasingly common, or the wedding will take place in only one venue i.e. the bride or groom's hometown. In this case it's common to rent hotel rooms for the entire opposite side of the guest list. For this, having a digial RSVP is useful to organise rooms.
5) For Sikhs, Hindus and Muslims, a wedding typically involves multiple days of ceremonies and meals with multiple venues for each one. Sometimes people will attend all. Sometimes they will attend only a few.
For events of that size, organising information is a big deal, and having enough of a heads up helps manage costs and be better prepared.
The website will be irrelevant in a year, but just the RSVP feature can potentially be extremely helpful.
Once you have the RSVP stuff in place, the map and other stuff just becomes basic pages that you may as well put in place.
There is so much you wouldn't do for yourself but do for the ones you love. That doesn't make it insane or just to not disappoint. You do it because it makes you happy to see them happy. If you would do the same if you were alone is not the thing that matters here.
You only pay around $10 if you need your own custom domain.
I know they're very common.
It certainly has that nice decentralised feel to it, as opposed to having an official Facebook event. Or using one of the "wedding app" companies.
most people still only get married once