Pie Factory Designer
Co-founder of Nevermore Games. Follow me on Twitter @bryanfischer
My understanding is that the cards used in payment are discarded and the rules clarify that cards remaining in the assembly line do not change in value.
I took this to mean there will be empty spaces and to make it clear that the cards to draft remain at the same price they should not be moved to fill in the empty spaces. Hope that is clear, I think.
Nick has it correct. Sorry for the confusion.