just because we have three, it doesn't meant that they aren't still rare. Think about how small this RP is, and compare it to the actually world I wrote about. There's still at least a million in just the area alone. I mean... I guess they aren't uncommon either. but different types could be uncommon. Most half vampires would have powers, I think, so his is kinda rare. 

I would like to say though, that it's not really that rare. but oh well.