It is not for everyone that they should turn their world upside-down and socialise with the dojo. That may be too much for some, with family, friends outside of Aiki, work, etc.
It can be great, the social side of Aikido, but I have never thought less of anyone who did not socialise. That said, we, my group from my Master, always talked about "family", and that has aways felt so. It is a very comfortable environment.
So, as the Polish say: