Even though the price range would be just an estimate, since it is being found mathematically it is more reliable than someone telling you, "this is a fair price". By price range I mean this method would produce the following: orc force 100tc-200tc. Showing the player how much that item is worth averagely (implying they can do quite simple math). They will be able to see the lowest possible price that people will sell/buy this item, and the highest possible price people will sell/buy this item.

This works for bulk items quite easily because all you really have to do is add up the average prices in that bulk. For example: Full 128 textures. The market method gives the approximate price for each one of these items (for the sake of the example we will say 1000-1500tc) so it really just depends on who you are dueling what the price will be. Since a lot of duelers are quite greedy they will probably consider each individual texture at their highest approximated price, add it up, and that's the price of a full 128 texture set being dueled.

I think you know that humans aren't as reliable as a machine when it comes to math and even estimates. It's impossible even for all the active, intelligent members in toribash currently to get the approximate price for each item in the game, even if they only had to update it every month (because prices do not change drastically in a quick amount of time too often).