I would go so far as to say that connecting two people, especially when you are not going to get anything out of it directly is the cornerstone of building credibility in networking.
Turn the situation around and think who do you prefer to network with A. Someone who only wants to put effort into things that benefit them directly and immediately or B. Someone who is willing to help you out even if there is no incentive for them to do so. I think you will find that most people will be turned off by A the "I want in return" networker and be naturally drawn to Type B.
It may even cost you some time and effort in the short term, but in my experience it pays off huge dividends in the long term.