Yeah, I didn't worry too much about anyone bringing a + 1 simply because this is going to be a super low cost, low fuss wedding. I snagged a nice lace sundress for 25.00 at Suzy. I think the groom's outfit will cost more than mine by a bit. We are taking the complimentary wedding package so whatever that entails, no more, no less is what we are going with. That being said, the idea of an OOT bag was something I learned about here.
We're not huge on tradition so it doesn't matter if my friends want to bring a guest or not, as long as they come and are happy. This might be a different story for a larger wedding where the costs can add up. At best we might spring for the resort photographer just to get a couple of nice pics that we can frame. I LOVE the work that some of the ladies have had done on this website for pics, but we really aren't interested in spending 5k for wedding photographs. I guess we kind of consider every day our special day (for the most part) so have a hard time justifying some of the expenses that are considered the norm for most weddings. Ie: the amazing dresses that the ladies have bought and shown on this site. For myself, I would rather buy a dress that looks beautiful but that I can wear again another summer. OR worse case scenario I wouldn't feel guilty about trash the dress pics ($25.00 lost wont break my heart.
Drat, sorry about the segue! Back to the topic at hand. Depending on how grandiose you are going might determine bodies on the floor, but for me if a friend is going to spend that amount of money to come to my wedding (and of course for a vacation as well) then saving costs for him/her by allowing a guest to avoid too much cost seems like the way to go.