Around here that's a rare story. Actually, I know nobody that did try this and succeeded. But then we don't have true offline retailers around here; those with offline stores sell most of their GPU stock in their online store at inflated prices. So I tend to chalk that up to survivorship bias ;-)

That's in Germany, we have some of the most expensive electricity in the world, and then the prices exploded since about 09/2021: Previously the cheapest offer was about 0.27€/kWh or maybe even 2c less if you're lucky; now we're at 0.35 to 0.45 for new contracts, depending on the region. I haven't checked the last few months (and especially not in the last week), but when I checked in early 12/2021 mining still netted some money (IIRC in the ballpark of 3 Euro/day/GPU).