You have to overcome resistance because of the distance and step it down at the connect (the people using it). The electricity needs -- as you said -- power to transfer. That energy needs to supply a lot of not just current but also future uses, many of which you might not be aware of when you set up the power grid. So, the power transmitted is always going to be higher than what a group of people need in a society where power is set up correctly.

I use the term power, because P = V I, or voltage times current. The resistance is higher on the web of power lines than at the home.

You are not comparing apples and apples. High power is generated and distributed using AC. The voltage is relatively high so that the current and I^2R losses are not too large. Most AC devices are designed to operate ant 110 VAC, 220, or 440. This is because their power consumption is low, and these voltages are high enough.

They use high voltage to transmit power using much smaller wires to transmit too much power ,but it needs professionals & equipment's to do it safely .then use transformers to bring volt to low safe to use at home.

Efficiency, it's easier to transmit 250k volts over long distances. Safety, you don't want a washing machine that you have to stand 20ft away from.