Fun flick, but left with lots of questions...

So, I saw this film years ago, and I just sat down and watched it again for the first time in a long time.

While I enjoyed it for what it was, and I understand it's meant to be quirky, campy, and certainly not meant to be taken seriously.. I was left with many questions.

1) Are there clans of vampires worldwide killing people, and nobody knows about it?

2) Has Merrick been searching the globe for the new slayer, or has he just been in Buffy's hometown? And exactly how long has he been looking for her? He says he didn't know if Buffy was the one or not. Had he been following her for awhile, or did he even have any knowledge of Buffy before running into her at the elevator?

3) Do the vampires continue on their spree during Lothos rests? I'm guessing he takes deep sleeps from time to time, as he's in the middle of one in the film.

4) How long have the vampires been killing people in Buffy's hometown? It seems like a fairly recent event with the news reports. And are Lothos and the other vamps assembling in her town because they have an idea that's where the new slayer is? Merrick tells her to keep quiet about her activities because once they know who she is they'll come after her.

5) In the locker room, why does Buffy ask Merrick if he knew the grave she was sitting on was a fresh grave? He had just told her moments before the new vamp popped out that the body had been dead for three days.

6) Why exactly can't/won't Lothos kill Buffy? I believe in the end scene at the dance, moments before turning to the rest of the crowd with a sword in hand, he says he can't kill her. In fact, there seems to be a lot of back and forth with his urge to kill her.