Honestly, you couldn't just tell an individual to buy a miner and let it run but don't expect any profit from it. Most of us couldn't afford a miner, let alone the power bills that is tied to it. Yes, every single miner in the network helps secure the network, but not every single one of them can afford to mine at a loss. It's not being selfish or whatsoever, it's just being practical in the current times.