I happily have people round and always have done. I do find it sad that some people don't want anyone in their home, to the extent they will miss out on friendships rather than open their door for a couple of hours.
I'm no fan of the unexpected drop in though, but I happily invite people round and have a house full on sat night.
@bluntness
I don't judge people who regularly have fuckloads of people in their house! So why do people who DO have fuckloads of people in their house ALWAYS feel the need to comment at how 'sad' people are, if they don't like having anyone (other than close family) in their house?
What is so 'sad' about it? I, (and many people like me) have a number of well-chosen, trustworthy friends, good relationships with neighbours, a loving, close family, (including husband and children,) a part time job, and several hobbies. How the hell do you deduce that I am 'sad?'
Why do you call me 'sad' because I don't do as you do, and live as you live?
Very judgemental and rude. It's because of people like you, that people like me are how we are. We don't want obnoxious, judgy people in our homes! 
You sounds exactly like the couple who mithered us to death to come for a meal at theirs, and asked us almost a dozen times until we gave in just to shut them up. Within a few days, they were wanting to know when we would ask them to ours, and they now ignore us because we never asked them.
Another woman we used to know was always asking half the neighbourhood around, and asked me around dozens of times, but I never went until this one time when I caved because I was fucked off with being asked and her not getting the message. Within hours she was saying 'your place next!' And then she kept asking when she could come around to mine.
It's pushy, obnoxious people like this who make people not want people in their homes. This type probably only want to come to be nosey, and to slag you off behind your back, and they ALWAYS outstay their welcome.