Right, I agree, but electricity prices are variable and location dependent, for example, it doesn't cost me 30c/kwh, it's more like 5 cents and 3 cents dependin

Right, I agree, but electricity prices are variable and location dependent, for example, it doesn't cost me 30c/kwh, it's more like 5 cents and 3 cents depending on the time. With that logic, the $20 in difference of $30 per year vs $10 per year of Pi is fairly meaningless for performance boost I am getting. If your electricity is expensive, sure, but I imagine the performance boost would be worth it for an actual homeserver that a G3 can make vs a tinkering/fun project you can make with a Pi.