I don't sweat the disk, but I think it's easier if the value of the objects is up in the air, and the big hauls are logistical challenges. as two orcs mentions. I once placed a boulder with some fossils in it as a piece of treasure. If the PCs could get it out of the dungeon it would be worth "over ten thousand silver pieces", but no precise count of its value was given. Was it worth it? Did they even have the ability to get the boulder out? Could they chisel out the most prominent fossils and sell them for a portion of that value? These were all things they enjoyed debating that were way more interesting both them and me than simply finding a chest of 7,821 silver pieces (and thereby, 7,821 XP) and hauling it out in sacks.You are saying use small, high-value objects to prevent the necessity for "Tenser's Floating Disk" or other coin-logistics conundrums for the party?