Pay midwife in advance?

Mandy
I'm a second time mom, but I'm interested in going with a midwife this time. I met with a midwife for a consult. Something that came up is that I have to pay for labor and delivery in advance in installments until I give birth. This just seems odd since I didn't pay a dime to my OB until after birth. Does anyone have any insight/experience with this?