Not with a serial, no. When I get fed up with a stand alone book, I'll skim through to the end, so I can see how it finishes. With a serial though, I just stop reading, though I do intend to finish it later. I stopped reading the His Dark Materials and The Black Magician Trilogy, both after the second book. I do plan on picking them up later, because I'm curious to see how they end. But if I'm fed up with reading something, I just can't force myself to read it any more, no matter how curious I am.