I can answer that question easily (and I have explained all of this in the past). While I decry fiat, I have no problem using it. It is "the coin of the realm" so to speak and using anything else in day to day commerce - at this time - would be unwieldy. At this time, virtually all local commerce is in Dollars. What would you suggest I do? Try to pay for everything in New Orleans Mardi Gras doubloons (LOL)? I'll note that I do some minor trading in silver with some local merchants who see the future of the Dollar just like I do and who prefer to be paid in silver. What my DW and I do not do is save in Dollars, seeing them as guaranteed certificates of confiscation. We see Dollars as a transactional currency, but not as a savings vehicle.
Kathy, you should recall that I've previously explained that I'm retired and, decades ago, intentionally planned to bolster my retirement with metals. Everything's not in metal; I have a stock brokerage account, bank accounts and other assets. I don't think this is at all odd. Many people bolster their retirement with antiques, camera collections and an infinite variety of other hobby and special interest items.
As to why I sell metals here, it's very simple. I used to sell a lot on eBay, but I found their customer service difficult and their commissions became too high. By selling here on TB2K I can offer our members deals that are below market values while still getting a return on my investment. Also, if you look at my transactions over the years, the totals are very modest.
I'll also note that at times in the past, I have sold metals for less than my cost just to keep the cash flow going. There are annoying, ongoing bills for things like electricity, insurance, doctors, hospitals, groceries, fuel and taxes...probably not all that different than your expenses.
At one point I suggested that we wear animal skins and forage in the woods for our sustenance, but my wife wasn't at all keen on that idea ;-)
Best
Doc