Originally Posted by
catonec
understandable I suppose. Do you have a set of car keys or a house key?? how often do you misplace fumble or drop them down a sewer grate??

That would be approximately once a month, and every 5 years.
No, but seriously, I find it easier to remember my keys than the odd tool, and I just don't want to carry around too much stuff, particularly bulky stuff. Even if that key lever is designed to clip on a key ring, I think I'd chapped having to carry it around all the time when I mostly don't need it. I suppose you could throw it in a bag, but with my luck, the day I need it, that'll be the day I don't have my bag!
Of course for a seatpost, not having a tool to remove it usually isn't a crisis. Wheels would be another story.
All that said, I don't use a QR on my commuter seat post, just a simple allen bolt. That's enough for my needs, thankfully. And yes, I have been in the position of not having an allen wrench! Aarghh! Man, if only there weren't thieves...!