I also think rescues are kind of responsible for setting a standard. You can't go around claiming that bunnies are best in pairs and then turn around and routinely rehome them singly. Lots of people (not just in the rabbit community) ask why rescues are so fussy, and that they're wrong to 'doom' the animals to life in the rescue rather than make a compromise on the home they go to (slightly smaller housing than standard, going singly, going to someone with more pets than they have time with, going to someone who's away a lot, etc). Yes, you could rehome them to these and increase your "turnover" but if you make an exception for one person then you have to do it for everyone, and then these boundaries will be pushed too, and you'll be encroaching on what's best for the animals. If you stick to your guns, people will have to change and slowly it will become more and more accepted that your regulations are just what the animal deserves - space, companionship, attention, etc.