Right now, the cost of electricity is 0.09€/KH/month or so, if you have 2500KH, paid about 225€/month for PoW mining. At current Altcoins price you lose money on PoW mining. Who are mining currently, do it with the hope that the Altcoins are revalued in the future to obtain the ROI.
In this scenario, I think it is smart to go to PoS mining, leaving PoW, with simple calculations for ZEITCOIN I indicate why:
Imagine you buy 10 BTC worth of ZEIT at current selling price: 0.00000002 BTC/ZEIT. You will get 500,000,000 ZEIT.
Twenty days after your wallet will generate during the first year: 342,465 ZEIT/day.
If ZEIT price increases during the first year, your daily profit would be:
If the ZEIT rise up to 0.00000005 BTC/ZEIT, you would have earned during that first year: 0.0171 BTC/day (6.25 BTC/year,
Total: 31,25 BTC).
If the ZEIT rise up to 0.00000010 BTC/ZEIT, you would have earned during that first year: 0.0342 BTC/day (12.50 BTC/year,
Total: 62,50 BTC).
If the ZEIT rise up to 0.00000015 BTC/ZEIT, you would have earned during that first year: 0.0514 BTC / day (18.75 BTC/year,
Total: 93,75 BTC).
It is more or less the same as PoW mining, but investing in PoS Coins instead of spending money on Electricity and Hardware, which seems more logical and clean...
The PoS mining cost has been 10 BTCs.
The PoW mining cost has been (Rig Cost+225€*12months) about 10 BTCs too. Now, PoW mining obtain the same rate (0.0171 BTC/day) than PoS ZEIT mining if ZEIT price was 5 satoshis, which is not unlikely... That's where is my bet... Although in my case did not have many BTCs to buy ZEIT, my calculations are more modest, but the principle on which they are based is the same as I show here.
You can do similar numbers to MINT, because works like ZEIT, but with 20% interest rate the first year, rather than 25% of ZEIT... And then choose the one you like more to PoS mining...
ECCoin is simillar too...