Can someone tell me why a tiny plastic replacement head for an electronic toothbrush costs $9.99, when the entire electronic toothbrush (with the original head) only cost a total of $19.99. The replacement brush is just a little piece of plastic with a few bristles and a hole where it gets inserted and connected to the electronic thing. I mean, am I missing something here? A new toothbrush (the regular kind) only costs $2 or $3, why is this thing so much more? I hate feeling like I'm getting ripped off. Bastards.