Taking care of business is not always a social event. Sometimes, as in some groups who practice Aikido, it is intermingled with social interaction, and sometimes it is not. In this busy world, accepting the fact that we are using each other for practice .... well ... it is what it is. We shouldn't make too much of it, or impose ourselves upon our training partners.
Funny thing about wanting to socialize with other people, we seek out those whose qualities are either interesting, or qualities we would like to see in ourselves. Sometimes people want to socialize, and sometimes it is just TCB, taking care of business.