Yes exactly, unless if I get ridiculously lucky and I find a block, but normally I will not make money from it. For me those Avalon Nano 3 are little heater devices that warm up parts of my home which I needed to warm up anyway so in that sense it doesn't cost more. And when mining in a pool you get some sats back. So for me it made sense to get into it. But I wouldn't do it with a big and expensive mining device at home...