Triggering the traps should be saved for very special occasions, as this exhausts the ATP in Dionaea quickly, and it is hard for the plant to replace this molecule which fuels the trap closure. Remember, there are no nutrients in the soil for them to easily regain phosphorous, so they need their energy to trap prey to build up their ATP reserves. My plants which grow outdoors really do trap more flies than anything else: almost every trap has prey inside it. They are very good at what they do, and require very little assistance from me.