So in my case, I would make a custom set for all items that cost 70dkp, 90dkp, 100dkp and so on, and just populate them with itemid's?
It sounds quite easy, just takes time to fetch all the correct itemid's.
But if you setup the list like this, its hard to also group items by class or whatever you need, or did I not fully understand how this works? :)
We have multisets for this, trust me, there will be very usuable examples and documentation for this
in the end a guild edits two files puts them online people drop those files into the addon and it "JUST WORKS"(TM)