I JUST GOTTA KNOW...?

If 'good Christian couples' are so desperate for a child to parent what would it matter what age, race, or background they are/came from? Why is it they're willing to pay out the nose for a BABY when so many children are available for adoption right now? Do to my sexuality I am unable to adopt a child from where I live from FC just now but I am perfectly happy to wait till its legal or move when the time comes that I am ready. I am also not planning on an infant. I would like to adopt an elementary/middle school age child 6-12 or so. So some 'good Christian person' or anyone else with an insight/opinion on the matter pleas feel free to tell me why you HAVE TO adopt a baby? They're just as likely to turn out like any foster child could. Those are GOOD kids, they simply need a home, why adopt one of them?