Standing at the Ceremony

I don't think it's a huge deal if some need to stand (assuming a short ceremony). I've been a guest at a wedding where there weren't enough chairs for everyone and it was fine. I would, however, be worried about space. It seems to me that venues overestimate how many people they can accommodate comfortably. So I wold be nervous about trying to squeeze 150 people into a space only meant for 100.

UO- I've been to two weddings where I had to stand, both ceremonies were under 20 minutes, one we knew we'd be standing beforehand, the other we didn't. As a guest, I don't mind it, I didn't talk about them being "poor hosts" behind their back, and I enjoyed both ceremonies as much as I would have if I had a seat (possibly more because I could actually see the ceremony, actually)

I understand proper etiquette is a seat for every guest during the ceremony, and people will say you're a bad host for going this route. But of all the things I could be bothered by when attending a wedding, this would be lower on my list.

I have been to several standing ceremonies and they have been nicely done. But they had everyone stand, were super short with small crowds and minimal waiting around. If there's the option not to, I wouldn't do this with 150 people because you also get issues with people not being able to see from the spots behind the chairs, etc.