You don't need the same but you need some and you need the kitchen running. I understand that it is less, but you may be overestimating by how much.
If they are really going to do 6 weddings a day as stated upthread you would think the kitchen staff costs should't be that high. Florist musician and photographer also shouldn't be full price. That being said the police aren't volunteering their services. From what I understand it's not cheap.
A backyard wedding isn't free either unless bubby is cooking, uncle yankel taking pictures etc. I doubt flower gmachs are open either.
The value of your wedding not being featured in the APP- Priceless.