My reasons for wanting a plan have nothing to do with the cost and everything to do with saving my family the hassle.
I know for some arranging a funeral would be a privilege, however for others it would be a chore. I have also seen family fall out over choice of flowers, hymns, cars, venue etc.
I would rather make these decisions for myself. My family are not surprised by this as I am known for being a planner and a control freak.
Funerals are said to be for the living left behind but as an atheist I would hate to have any religious element to my funeral. The financial cost and environmental impact concern me too.
My ideal would be a direct cremation with my family getting together to scatter the ashes by the sea at a later date. I will leave money for a slap up lunch and if they want to commemorate me they can donate to the RNLI on my birthday or get together in our special place to eat lobster and drink champagne.