Basically its like deja vu all over again like in Winter of 2013.

The RX470/570 which is the 7970/R9 280X equivalent is sold out globally and nowhere to be found.

The RX570 basically makes exactly the same profitability as the 280X did back in 2013. Actually a little more profit since it uses less power than scrypt.

From those of you that weren't around. Mining was crazy profitable at the beginning of 2014. A 280X made somewhere around $7-8USD/daily. Fast forward 6 months later in Summer 2014, it was borderline profitable since it consumed more electricity than made profit.

What killed GPU mining back then were introduction of Scrypt ASICs which made the difficulty skyrocket exponentially and combined with the MtGox bankruptcy and falling BTC price.

Now since its 2017 there are many factors that can kill these amazing profit-abilities.

1) Ethereum goes POS or reduces its block reward.

2) Ethereum (ZEC) prices crash.

3) Bitcoin price crashes due to hard-fork UASF

4) Difficulty skyrockets. This I doubt since ASICs are very difficult to manufacture and sales of GPUs only provide linear difficulty growths. Currently there are GPU shortages which are capping the difficulty growth.