DEAR MISS MANNERS: I must admit I’ve never understood etiquette’s requirement to invite people to one’s home after being invited to theirs. When my spouse and I host, we feel that it’s our idea — nobody asked us to make a dinner and invite the group. We enjoy cooking and spending time with everyone. Is it not improper for hosts to expect that they will be “repaid” with invitations from their guests? GENTLE READER: Your statement is akin to the frequently argued one that people should give presents because they really want to, and therefore responses from the recipients are unnecessary. So onl…