So you have to charge your EV to drive it, and you put up with that hassle because it saves you money, and doesn't need gas. So you put in a larger stereo, but that needs to be charged separately because that will kill your engine's battery.
So instead of mpg costing you about 60% of gas, it costs you closer to 75-80%, and the bigger stereo you go, the more juice you use. With gas, you add a larger alt, and the ongoing cost is nothing extra.
My stereo, is the one reason, I would never own a hybrid/EV (for a daily driver). If I go deaf, I will figure out what it takes to put a wrecked tesla drivetrain in my pickup. Until I don't care for music anymore, the butterflies can choke on smog, and kiss my ass.