Yes ferrets need a lot of attention but their social needs aren�t as profound as other animals. I have had single ferrets (never lasts longer than a week or two they are addicting). I get another ferret then followed by yet another and another. I simply love ferrets and love to have them around me.
They are on fast forward when they are playing. But the majority of the day they sleep. They burn a lot of energy. So actually ferrets make pretty good pets for people who can be around all the time. Taking care one or seven ferrets makes little difference. All my ferrets, except for one, sleeps in the same bed; one of the ferrets curl up (winter now) inside a pair of long underwear britches at the bottom of the cage. The cage still has to be sanitized weekly, cleaned daily, water changed daily, so I see little difference between one, two, or ten. It makes it harder for a non walking person to get around, three little munchkins running up my pant leg, stealing my socks, jumping from where ever to lap. They can be interesting, or is that they never stop being interesting. Here are my ferret articles and pictures of my ferrets.
Pet Ferrets