Maintenance fee: 0.0035 $ / 10 GH/s / 24h"

This is not an unfair price.  In November when BTC was 7k a coin it was the same.  It just takes longer to make your money back.  And if  you do not think BTC will continue to grow why would  buy in at all.   For me it was simple math.  I bought 10 th's  before the price increase.  150/th vs 220/th now.  at 15k per coin you were looking at about 2 months to Break Even if price and difficulty stayed the same.  To me I had a better chance of that vs BTC doubling again in 2 months. 

this is all just gambling.  BTC could be back to 1k if someone hacks one of the main sites and steals a bunch of BTC.  Just don't put anything in this that you are not willing to loose. 

Good Luck and lets all hope BTC keeps moving up.