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i am sure that the difficulties of zec will be increase as there are many starter miners see that mining zec is an opportunity to them and they can get much of zec right now. but its depend on how much hashrate we have to get much of zec, beside that i hope that zec could be increase too.
Yes, but the higher the hashrate you want to have the higher price you should pay for the miners. Idk, I still think that to mine Bitcoins is more profitable because:
1. The price of BTC is more than 20 times higher than the price of ZEC.
2. ZEC is new and unstable, so the price of it might drop even more in the near future.