When I acknowledge the issue here, at the same time I also know that the money is a limited resource we have and we have to use it wisely.
One solution to this which I can think of as of now is - Just calculate the per person budget for accommodation on sharing basis and one should be able to find a single room within the same budget (may be not at the same place though).
I also believe that everything has its own pros and cons. When you stay together with other people and in company, it is always more secure/safe and more time to socialize and you are free to choose with whom you want to stay (considering other person is also agreed). I also believe that, conferences are time bounded (maximum of 2-4 days), where we can adjust things and help Fedora to use money wisely in stuff where it is required the most.
HTH :)
Regards,
Amita