Conon EOS sticky shutter

My last roll through this guy had half the frames showing only half of the frame. I assume this is due to the shutter not firing properly. I have no idea where the shiny blob came from on the shutter, but that may have something to do with it. Any ideas? Is it worth having repaired? The camera is otherwise in top condition and everything else works perfectly, but used bodies are cheap.

Thanks,
Bob

This might help:
http://photonotes.org/articles/oily-shutter/

Informative article. Thanks,

Bob