Personally I'm not a lot interested in a lot of subjects here either, but I do like the digest form, so I simply skip over those I don't care about.
Every once in a while I will go and check out a topic, but ie old sewing machines are not my thing, I know a lot of them like and love them, each to their own, so i simply skip it.
I do agree a few more sub catagories would be nice, vintage sewing machines, purses, clothing, family etc.
But if not I'll simply move on to the next topic that interests me.