AHHHHH. Whenever anything is successful it goes centralized, is this also happening with MASS? Reward going down for people that have low storage means people with high storage volume will get bigger piece of cake. This is exactly whats going on in BTC.
This is true for any coin that can be mined. All coins are subject to increasing mining difficulty over time. However, unlike CPU/GPU mining, mining on HDD is more resource-intensive. It is more profitable to buy videocards than capacitive HDD/SDD (4-8TB or more). And no one can prohibit single miners from joining pools; this is historically the case.
I think both are same way of climbing the same mountain. MASS was different in a sense that it allows individual new miners to mine a crypto coin that is previously not possible. I think its still best to buy MASS from exchanges as its value will go up in days to come.