How many kids are you allowed??- foster/adopt

I was just wondering about something. OUr state allows foster/adopt homes no more than 8 kids/ home. I'm wondering how come there are so many families who have large numbers of children in the home? I would love to have a large family, but seems our adoption laws limit the number. If we get the two foster/adopt kids we're waiting for, then we'd have to wait until our oldest moves out to adopt again.:mad: so those of you who have added to your large families through adoption - how did you do it? Do they make exceptions in some cases?