Stacking is just like life, it comes down to your personal choice. I know that when I tried to sell some high premium stuff, it was put on a scale with the regular bullion. If you have a few pieces that will never go on a scale (at least while you're alive) thats OK. For me now, I buy the cheapest bullion I can find, or deals like I recently posted on 2 more watches, but they aren't solid gold, so they don't fit into the stack at all. They go in the quick flip pile.