Building wiring could be made out of gold instead of copper or aluminum, simply because gold has the lowest resistance of room-temperature wiring. A gold/copper alloy (or gold-plated copper) might be the best choice for plumbing (due to gold's corrosion resistance, platinum is another choice here). Gold plating would be an option for metal roofs, car parts (which don't experience significant wear), fences, hulls of ships, antennas, and general electronics.
Gold is over twice as dense as copper or steel. That much weight could be an issue in a lot of those applications, particularly roofing. There's a reason why we use very thin metal roofing material: weight. Adding even a very thin layer of gold to that could have a negative impact on weight constraints. Also, gold is highly malleable, which is bad for any parts that are load-bearing or sustain impact events.
People assume that a download is worth less than a physical copy because they can't physically hold it, however if you consider the actual cost of a dvd the difference in cost will be a couple of cents at most.
Let's not forget about the printed booklet (which is vastly expensive if you listen to ubisoft), the box it's held in, the plastic wrap around that box, the cost of loading it onto a truck, moving said truck halfway across the US, unloading it from the truck again, and getting some highschool monkey to put it on the shelves. The shelf space itself may cost money too.
It's still bullshit that physical games cost so much, but that doesn't mean there are no costs involved with producing them.
Stellar rays prove fibbing never pays. Embezzlement is another matter.