Well it's not "too" expensive and I can surely say that a lot of miners mine with a much higher rate.
Anyway I could only speak for myself.

I pay about 0.045 per kW/h where I live. And it's pretty awesome. Right now with three gtx 1060s I pay about $16 only in electricity.
If zcash pops back up to $245 per coin, I'd be getting about $5 per day from these three cards.

That's about $135 per month without almost any efforts. Do your calculations yourself and see if the profits are acceptable.
Each gtx 1060 takes about 120w and for the system itself add another 110w.

Do the math and decide (take into consideration how many months are needed to get roi).