Seriously, I've tried tipping countless statues (I'm starting to believe that is a joke.) and I have only encountered one vampire, in another world.
Can anyone confirm the Statue part or atleast tell me where vampires usually spawn?
I guess, you're talking about adventure mode - else it wouldn't make much sense.
First of all:
Look at your world_gen_parameter:
If there is a 0 behind your number of vampiretypes, then you had bad luck rolling this world in WorldGen.
Then:
How long did you run your world in WorldGen?
If it's to short than there will be no vampires.
Then (for becoming a vampire):
Did you try to defile an active temple?
There are some temples who will be abandoned throughout WorldGen - normally new ones will be build in said town.
You also have to be lucky to get the vampire-curse - more luck involved in finding the right god.
And yes, it works.
Then (for actually finding vampires):
Ask people for troubles and choose "beasts".
They will tell you about a vampire you can hunt.
If you don't want to talk, then search for yourself:
Flashing persons -
- being muscular and having white hair (only for humans) in the description;
- trinkets of sapient beings in their inventory;
- revealing that they had several proficiencies in their life while asking them about;
- revealing that all of their family died hundreds of years before (in case of goblins and elves it's a bit tricky).
Or just denouncing every single person you'll meet.
At some time you will find a vampire by pure accident.