+1dirtyrob.... I also think it's fair to say that most of us that buy bayonets, do so to fulfill a certain desire or satisfaction in completing a specific battle rifle build. Or cloning their favorite military rifle in its entirety. Having the proper bayonet, especially an authentic one, not only adds to the excitement of building a rifle u always wanted, but u have to admit when building a clone of a modern beauty like the Sig 55X, the bayonet def gives it a Vicious look!
I don't think most of us guys who buy bayonets for our rifles, carbines or even pistols is some cases, buy them & leave them on at all times for home defense. Also , like stated above, knives usually go hand in hand w/gun owners. Bayonets are a great addition to a knife collection because of the many capabilities that they provide that most high carbon fighting knives just can't deliver. Lastly, I have to say that being a US Marine & having fought in Anbar Province in '04, '05 & '06, I have to admit that although I personally never had to employ my bayonet (other than for basic utility use) having it readily available when patrolling the streets or having to clear homes & buildings, certainly gave me a little more sense of security. Which was always welcome.