One thing I have found is that many times a company will issue two grades of a product. One is a "big box store" grade, and the other is a "high end retailer/wholesaler" that sells to the public and professionals.
Sometimes that quality is very close, other times it is no where near the same product, even though they look the same. For a faucet, the valves are plastic instead of brass. The body is plated plastic instead of metal. Instead of copper tubing to transport the water, it's PVC, the list goes on. Additionally, quality of assembly is also lacking. Companies contract out their cheaper lines to mass factories overseas where the quality is just "good enough" and they expect it to last a few years, then get replaced by the new shiny. The better pieces are assembled in places like Germany, US, Canada, etc., and the quality/durability is much higher...high enough to last a lifetime in some cases. So while you may walk into a plumbing supply house and see $500 bucks for a faucet, gasp, and exclaim "I can get one that looks the same at big box store for half that"...you're right. It may look the same, but I guarantee you it won't last the same or perform the same over time.
Another story. I used to go through watches like crazy. $100 watch never lasted more than 9-12 months before it became banged up and unreadable, or just plain broken. I bought a TAG one year after hearing someone brag about how sturdy theirs was. I've never had to purchase a new watch since, and it only needed to be repaired once when a bezel spring broke. I bought that watch over over 20 years ago and I've saved a lot more than I paid for it. Yes, sometimes a bad deal is just a bad deal, but other times, it pays to invest in quality products that you don't need to re-buy every 1-5 years.