Everyone likes to talk about difficulty rising so profits will decline, when in reality the price will rise with it. Look at Bitcoin. It's always been profitable to mine. The difficulty rose, but so did the price. It was profitable to mine three years ago, it's profitable to mine now. Crazy how that works.
OMG - this ^^^
What you people are all missing the point of is that difficulty acts as a mediator between inflation and deflation. A coin with too many miners generates too many coins, which will be dumped on the market, dropping the price. It will get to the point where there is no point in mining it. Don't be fooled; a majority of miners out there are NOT mining it based on ideology. They are chasing ROI.
Let me give you an example; with Monero. The same power mining a half year ago and the same power mining today on the different difficulties yielded relatively the same profits +/-. But no one talks about that. Why? Because too many idiots are still comparing ASIC resistant Altcoins to Bitcoin mining.
Bitcoin mining took a spike in difficulty because of the release of NEW TECHNOLOGY that hashes faster. It killed the GPU miners. Monero, ETH, ETC and ZEC do not have ASICs. This mysterious spike in difficulty that so many neigh-sayers are boasting; where will it come from?
Yes you can make Mining a career but you are taking a heavy risk. You have to consider many several things.
1. The cost of the rigs and their efficiency.
2. The placement of said rigs. Once you hit a certain amount of rigs your breakers won't be able to cope. They will also generate a crapload of heat. I got 4 rigs in my bedroom and during summer its bad. My breakers can cope though.
3. Cutting costs; locating sources of cheaper equipment and looking for cheaper electricity sources, ie. Solar. Solar took my costs from 0.187AUd to 0.09AUD per kWh. Min you, I am in a pretty decent profit even at 0.187kWh. I also have the luxury of converting the coin from USD to AUD which is at a rate of about 0.76c as of today.
4. Market stability, coin utility; ie. Fundamental Analysis and due diligence.
If you read most of the misguided posts in this thread you will find that the qualms are mainly with difficulty. But no one has taken into account the price rises that accompany difficulty. No one takes into account the fact that Divergence of Dif/Price are short lived. And most of all no one takes into account the REASON BTC dif skyrocketed and why Altcoin Algo's are mitigating this with the resistance of ASIC.
You might not make a full CAREER out of mining. But you will supplement your income with a hefty (tax free in some cases) residual boost, that you can not only CLAIM tax credits on, but claim tax credits on your electricity there-by lowering your overall costs!