I want to believe that's just his tail. [**crosses legs, just in case...**]
As for the OP's question, I think it depends on the title. Gone are the days when any c-list poster is worth a few hundred just because it's old, silents in particular. Title, stars, and quality of image are becoming much more important, although stars less so as fewer and fewer collectors even know who these old timers are.
IMHO, this is just the natural wave that flows through collectibles as one generation's movies and toys are superseded by the movies and toys of the next generation, who could care less about the interests of their elders.
Don't worry, it's going to happen to your posters some day too. Bwoohoohahahahaha!