In fairness to some talkers, some people feel as if it's "making an effort" to try to keep the conversation going when faced with someone who sees no need to "make a similar effort". Talkers often like people and see conversation as a way of "relating" and sharing.
Some people aren't all that tuned into caring about making much of an effort. Some just don't have many ideas to offer. Some have found themselves with someone they don't have much in common with.
Personally, I give credit to anyone who at least tries to hold up the conversation. If I'm not interested in what s/he's saying, "too bad about me". Better that than be sitting with a lump who doesn't bother, doesn't have anything to contribute, or withholds what he has to contribute because he's too afraid to just relax and relate.