No fear at all..
Assuming the 50TH/s is comming on very short term (compared to Avalonchip order, BFL, KNC and other) and hashing power will grow with expanding it ->
Hardware sales from chips and maybe complete miners (who knows)..
Calculations will say that in 6/7 months you will have your money back only from dividends per share.. Even if they are 0.00005 or 0.01 worth a piece..
All this ofcourse with the Bitcoin Market in mind (you never know what happens).. Hell, maybe BTC will go up and then double profit; hahaha
* demzie long term thinker