You wont get rich from it but it doesnt drain battery or use bandwidth from what i understand its a simulation of mining.
So why not?

Its just free coins in essence.

Currently worth 0.02 so based on 3 ETN a day thats what 63p a week?

But nobody knows the price of ETN in the future i think its ATH so far has been 0.18 still not loads, but they have 70,000 mobile miners and over 1,000,000 registered users at the moment. I'm confident the price will increase but no idea by how much..way i see it if you can set it up in 5 min and leave it run then why not. If its a hassle then maybe not bother..