It's a slow mining start, so total supply right now is only 5000 ZEC

By New Years, supply will be around 300k ZEC, and 216k new ZEC will be added to supply each month for 4 years after that.

Think of it this way, once the normal rate of mining kicks in after first month, any price higher than 0.25 BTC/ZEC would mean the daily mining rewards would be higher than BTC's ~$1.5MM per day.  

If ZEC price is above 0.25 BTC/ZEC, then miner's know they are being overpaid so they dump 100% of their mined ZEC until the price goes lower than 0.25 BTC/ZEC

Ethereum daily reward to miners right now is about $318k

If daily reward to ZEC miners is the same as ETH, then ZEC price would be about 0.06 BTC/ZEC  <----------- this is a realistic long-term price for ZEC after a few months of mining

You go long on poloniex now, and you will get rekt by the inflation