They do all that but still live in poor conditions as one of the world's poorest country.
One guy assumed that voodoo makes you rich, but the only time that voodoo is portrayed like that is in movies, and i pointed it out, so how exactly is that "nonsense"
They think that the Loa will help them, like if they're sick, if some of their cattle die, or if a woman isn't fertile. Like the original commenter said, they live in poor conditions, I doubt they have a high class education, so how would they know whether or not there Loa or gods exist?
WATCH VOODOO CEREMONY VIDEO BELOW FROM HAITI: