The best way to get more heavy metal plates on the market is to add an Adoulin Voidwatch. Make every monster drop pouches, and HP bayld and have cool ilevel gear and nice accessories drop at a low rate along with some bayld... Make it a bit easier than original voidwatch was when it came out so that groups of 6-12 can do it easier, and BAM. More plates.

Giving the relic upgrade materials out with points effectively killed most incentive to do old voidwatch in groups for the time being.