Believe it, the last line made me go "OH" out loud.
The last line is GENIUS. It completely brought the poem into a new light, was so creative and just overall... brilliant. I was prepared to call the poem mediocre until I read that, and now I daresay that because of the overall building up to and so not disappointing with the ending, this is one of your best, perhaps the best.
Build a man a fire, and he's warm for a day. Set a man on fire, and he'll be warm for the rest of his life.