it's not going to work well at all. The crucial aspect of creating a quality vaporizer is temperature control, and you do NOT have precise temperature control holding a lighter to a pipe. Did you read the instructions? You need to carefully hold the flame so that it's not touching the pipe, but the air you inhale still needs to be hot enough to vaporize effectively.
I'm not saying that the idea isn't valid, it could definitely work, but there's no way in hell anyone is precise enough with their lighter placement to make it work in a realistic way.