I think it would be better if mats that are above 15k were sold in smaller more affordable batches. You divide a batch of 99 into 33 and add a little extra to the price for the smaller bundle. EX: ItemA x 99 = 9k, itemA x 33 = 3.5k. But, people already do this. If you're looking for a specific amount, a commission board per server might be a better idea for you and many.