GPU mining is a good option in my opinion; mostly because:
its simple, your rig will be your rig whatever happens to eth (eth is not the only pos coin around)
and you can sell the rig for spare parts easily (if it becomes unprofitable).
if you have the know how & relatively fair-priced electricity go for it.
if you need to learn about it this is the place: Mining (Altcoins)
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-snip- how profitable is that.
it'll all come down to your electricity's per kilowatt price, the price of eth & networks hashrate (diff.)there is know way to forecast that! only guesstimates!
of course you can always use a profitability calcs but the validity of their answers are short term!
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Is there any safe/legit platform where one can park his ether and earn a return on that.
please do let me know if you find one!but the concept of such an institute'd be contradictory to the concept of decentralization!