Bitcoin mining is very lucrative when you decide to going in for a long term investment plan. The profit nature of bitcoin mining strongly depends on how long you decide to mine without pausing or quitting. If you invest $10k into building a mining rig which generates about $50 worth of bitcoin within a day and you decide to mine for a year without touching your Bitcoin earned via mining, the profit will be massive even if the price of Bitcoin is down. Bitcoin mining is not short term something to judge how lucrative it is.
Bitcoin mining is indeed for long terms because its slow to generate income via bitcoin mining but the only advantage is that your income is consistent no matter how low that value of bitcoin are but there are still two things to be considered . one is the electric cost and second is the capital for your mining hardware . if you can afford the electric cost or if the electric cost is too afordable and if you can also afford a mining hardware or a mining rig then that is the time that you can say that bitcoin mining can bring exessive income .