I was thinking of expanding my mining rig by 7-8 times (I have around 1.2 Mh/s right now) however as soon as I saw this 2nd graph (https://hashco.ws/profits.html) I changed my mind instantaneously. Is this graph representative of the general picture (only 2.5-3 USD per Mh/s up to mid-november)? Do you think the profit ratio/BTC of alt coins will be flat/increase/decrease within the next 12 months?
Well considering that you are a Financial Analyst you should be telling us.
Anyway, yes the general profitability trend will continue to head down as people keep building rigs and thus adding hash rate to an already saturated market. Even if the price recovers a bit, the hash rate is still growing so the days of paying off your new gear in just 60-90 days are over. A lot of newcomers don't want to believe in this however, so they come up with all kinds of ways to justify buying overpriced gear chasing profits that essentially disappeared months ago.