Relationships in general make people a bit nervous. It's about trust. Do I trust you enough to go there?
I think its fantastic if your idea of fun is cuddling up on the couch with a movie or just relaxing together. However, I am not in the market for a total couch potato. If there is zero activity in your life, we will probably not be the best match.
However successful you are, there is no substitute for a close relationship. We all need them.