If you got very cheap/free electricity, mining is profitable.
If not, then no! ^^
that's is only true if you do not instamine and mine bitcoin, or other high diff coin
with new coin cheap electricity does not matter, it matter more how fast you're to grab a good amount of coin at launch
also there is to be considered the initial investment, which is very big if you want efficiency
So amph does the old-style "mine, dump, next" thing
The problem is most altcoins are pump and dump so some make profit mining quickly then selling. Specifically sha256 there is not a lot good longterm altcoin.
And there is not a lot of new coin launches. So I don't think this ill happen to often at all. You can watch nicehash to see that it's not really worth it it's been running under BTC prices for a while. It's currently around 5 under BTC mining amount.