I love the idea!
The bride and groom have paid a lot of money for photography and having people's phones taking pictures in the pictures doesn't look as nice.
I had a friend who Snapchatted the bride walking down the aisle, but the friend had drawn arrows to multiple phones (and an iPad) leaning into the aisle to take photos. I'm not sure if my friend, a photographer herself (though not at that wedding) realized the irony of that photo or not. I hope she did.
And I've also seen bloggers Snapchat parts of the wedding. We get it, you have friends and you're dressed up. You do not need to use the wedding to advance your brand.
I think it's so much more respectful to the couple for the guests to not be focused on taking pictures. While your pictures may be just for your own enjoyment, they take a little bit out of their wedding. If your phone is in their photos, it dates the photos and makes them not so timeless. And the bride and groom may look out and see you on your phone at their wedding.
I'm pretty sure that I'll ask my guests to keep their phones put away for the ceremony and most, if not all, of the reception. I wouldn't want my guests' attempts at photography in my professional photographs.
What do you think?
P.S. Yes, I'm aware of the slight irony of using a photo of my bouquet from a wedding I was in, but at that moment, the professional photographers were taking photos of the newly married couple across the lawn from us, the guests were inside the venue, and the bridal party was waiting outside for their pictures to be taken. So we were in a private enough area that having our phones out wasn't disturbing anyone.