what you have done selfing each flower Is o.k too. What this does in easy to understand language is to intensify the genes if you like. Which means any good traits the plant has could be made even better, i.e stronger colours,bigger pitchers etc,on some of the offspring but it also works the other way meaning the bad points could get worse i.e bad pitcher shape,mouth of pitcher doesn't open properly and so on.
Remember you only need one really good plant from a batch of seed to make it worth while.
carry on and grow some of them,you might be surprised.
ada