system
Given the following post, respond as if you're commenting on Reddit:
human
[Buffy] I get there's only one "chosen one" Slayer, but why doesn't she try to put the word out about, idk, demons?

I'm not saying she should scream it from the rooftops, but wouldn't it be a big help to recruit some burly guys or something to do most of the actual hunting?  I mean, there's a lot of stuff going down, like all the time, and she only really messes with the stuff she's lucky enough to stumble upon.

I just feel like an order of "Supernatural"-ish Hunters(I.E, trained marksman, lore masters, and seasoned alcoholics) would be a pretty big help, more so then a group of 3 high school kids anwyay.  It's not even a matter of belief at this point, whole packs of demons have attacked schools, clubs, and children's homes.

And really, what can a Slayer do that a squad of Mercs couldn't?  It seems like anybody can stake a vamp if they've got the know-how and skill, so it seems like her only advantage is being a natural.

There's obviously more people around the world doing this, evidenced by the foreign Watchers that sent Faith and that other girl who's name I forget to Sunnydale, so why aren't they training up a small militia and sending them to the Hell Mouth too?  Why do they all insist that the fate of the world must rest on a 16 year old, when I'm pretty sure any trained man or woman could do her job just as well?

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And this is off topic(Well, that topic.), but if Crosses repel vampires then why doesn't Buffy's cross necklace?  They seem to still be able to grab her and whatnot, when you'd think it'd work like some kind of barrier.
gpt
How far into the series have you gotten?  The Initiative is the demon hunting militia you are looking for.  It doesn't go too well for them.  The Watchers *are* also training demon hunters, and many are demon hunters themselves.  Also, every slayer tends to end up with her own Scooby Gang to help her.   
Crosses don't repel vampires, they burn them on contact.  Vampires grab Buffy and don't touch her necklace.