While you will probably not find a coin worth $50,000+ in your pocket change, you could very well come across coins that are valued at anywhere between 5-500 times its face value. Quarters made before 1964, Indian head pennies, and many other older coins are worth far more than their numismatic value. Older coins that are in extremely good condition can also have a higher intrinsic value.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.