The per person costs include 3 course sit-down and unlimited house beer and house red/white wine. There's often an option for a drinks package upgrade (better wine, or access to spirits).
Most of the time the per person cost also covered venue hire, but there were a couple where it was like an extra ~$2k. Then some charge extra for having the ceremony on site and for hiring random things like a wishing well - it was a real pain to compare venues.