Could've swore that I answered this one already, but it looks like I missed this thread somehow :p
Anyway, it wasn't until looking at the list of the six Pokemon there that I realized... I really don't care for most of the Fire type starters. For the starters in gen 2 and beyond, I'm indifferent about them, or in the case of both Chimchar and Tepig, I just can't see myself ever using them. That just leaves Charmander, who I ended up voting for in the poll.
Maybe it's because Charizard was seen as the coolest Pokemon back in the early days of Pokemon, but I've always had a soft spot for it, even if it isn't my favorite of the Kanto starters. And even though it'll be hard to come by, I still want a Charizard Base Set card in my collection, just to say that I have one.