Maybe it goes like this: subject is quite interesting but similarly too opaque to be able to comment on topic. So you give it a +1, in the hope of coming to the

Maybe it goes like this: subject is quite interesting but similarly too opaque to be able to comment on topic. So you give it a +1, in the hope of coming to the first page, the audience grows and so the probability of someone knowledgeable of the subject to add such a comment, so that a discussion may start. I am doing like that myself.