Heck, I am a crazy person. I do not mind paying a couple hundred bucks for something that will save me 1mpg. I am looking into cameras to eliminate my side mirrors.
For me, this is a hobby. I love it and it does save me money (even if the return may take a very long time). I would rather spend money on something cool that I own, than to continue sending money to our enemies overseas for more gas. So, spending money on items to help me save fuel is a no-brainer.
Matt