Why we have to compare the investment by BTC?
Think about if you invest gold or silver, how you judge win or lose?
Compare with GPU's power consumption, I don't know to judge Avalon buyers win or lose?
Therefore, I think the topic is totally wrong. When I saw this "I need 20 day to get invest back.". I have a feeling which in Chinese is "得了便宜还卖乖！" I don't know how to translate to English.