They have others in their church, so they do meet others. And they do go to camp, they have church camps they attend. I am not sure why you think they don't get dirty? If my kids were on National TV I would sure be trying to keep them as clean as I could also!
My 7 year old brings in the trash can every week too--she wants to. She thinks it is fun. It only takes a few minutes out of her week and she has plenty of time to play.

My 11 year old is expected to empty the dishwasher and help with the family laundry and clean bathrooms. The 7 year old also sets the table, puts away laundry, helps clean toilets and empty trash cans. They also usually get their own breakfast and their own lunch. AND when they play outside I expect my older one to keep an eye on the younger one, and sometime she helps her pick out her clothes or get her bath. Call CPS! My kids have no childhood because they have to do chores and contribute to the family!
I think that everyone needs to remember that ALL you really know about this family is from a few hours on TV. Filming the kids out playing for hours does not make good TV. Showing them all fighting or wrestling around did not fit the "goal" of what the show was supposed to show--a very positive, upliftine, organized large family. ``` Just because you saw it on TV or read it on the Internet really does not make it true
And a special thanks to all of you that belittled my life goal of becoming a teacher (which I did) and wife and mother (which I did and am completely happy with). I was raised by a feminist mother and went to public school. Yeah, she was really disappointed with me when I choose to get an education degree too. And when I quit to become a SAHM she cried. She still asks constantnly when I will go back to work (NEVER I hope). Don't you just HATE it when those darn kids rebel!
The biggest issue here is that you are all approaching this with YOUR world view. This family does not share your world view. Unless you have lived in their world, or experienced it then you have no real idea what it is like. I have homeschooled (yep, that about killed my mom

) I lived in an area with many Ultra conservative Christians that share many of the same values that the Duggars do. I was friendly with many. While none had that many kids, several did have large families. Many had very long hair and wore conservative dresses just as the Duggars do. They do believe in teaching their girls about the "woman's role" in the family. There are special homeschool curriculum's out there for that. Just because it doesn't fit YOUR idea of normal doesnt' mean it is wrong. Not everyone wants to be a feminist. Not everyone wants to be an engineer. Heck, most think a lot of us on the DIS are FREAKS because of our love of Disney.
They know they are not "normal". They don't want to be normal--or worldly as they call it. Some choose to completely shelter their children from all that is in the world on farms or religious compounds and never socialize with the outside world. The Duggars are not like that. They are not "shocked" by wordly people that dress in jeans, they go to Disneyworld and to the store, to homeschooing conventions and restaurants and other public places. Nor do they judge them. They just do not live their lives that way. They have their own old fashioned Biblical views about how they want to dress, have a family and how they want to live their lives. I have never heard them say that they will require their kids to live on their land, they just have that opportunity if they wish.
They realize that they are an "oddity" --they were already well known among the Internet homeschooling community before the TV shows--and I think they hoped that by going on TV they could help others see that their life is a positive thing and as a means of sharing their faith. Personally I prefer that to someone lecturing me about my wine purchase in the grocery store or asking me in a parking lot if I "know Jesus" or ringing my doorbell to convert me at home.
I haven't seen anything that says that they DON'T socialize with others through sport teams or lessons or classes. Just because they didn't show it in a TV show doesn't mean it doesn't happen. The homeschooling world offers many opportunites to meet all different people, and where we were the Ultra conservatives didn't have any problems being friends with us, jeans and shorts wearing Methodists!