Yes, we all have some lessons to learn. Some of us get excited, buy up every rusty old USA wrench in sight and post photos of our treasures. Then, we list them here in the classifieds and not a single offer. I gave away twenty wrenches on eBay for $5 because no one here would even pay shipping. Just because it is old and USA doesn't mean it is collectible. Single wrenches have to be Snap-on, Plomb, Proto to get much action here. If there's not a complete set, they usually don't move.
FWIW, used tools began for me as a way to afford tools to work with, then became a hobby in its' own right, then, I began selling a few to afford to upgrade/expand my tools. The past forty years have been fun, I've now got more and better tools than any working tech I know and none of them were bought new. They've all come from garage sales, estate sales and very few from eBay.
As mentioned above, today, when I buy a full box or a tool chest, most of what is in there is re-sold, traded or given away. Always, somewhere in the greasy depths are a few worthy additions. Through the years of cleaning, sorting and upgrading, I've got a wide variety of Snap-on stuff; diesel, some older US, some import, some engine rebuilding stuff, some 3/4"dr, most more specialized working techs have never seen. May never use it all, but occasionally years down the road, that one socket in that one application pays for the whole box.
As far as the old tool boxes with patina - either you get it or you don't. Nine out of ten obviously prefer the shiny new ball-bearing stuff. Me, I enjoy seeing the places where the paint is completely worn through and every time I use it, I'm thinking about the guy who made an honest living out of this box and how it paid him back for his investment with the enjoyment of using a quality tool. Good tools are their own reward.
Bottom line, if I could afford to have the tool truck stop by every week, I'd still not enjoy buying the new tool as much as finding the good old one for 1/10th the cost. I'm adding value and having fun by walking into a sale, looking through the piles of garbage and recognizing those quality tools which just need cleaning, sorting and passing along to a good home. Your time and money, your tools, your decision.
jack vines