Why hold contracts is possible? While you change the duration of contracts from lifetime to OME YEAR ONLY? And Your prices have often changed ($0.60 per 10 GH) reached up to ($2.4 per 10GH) with higher and lower rates of exchange Bitcoin to Dollar?
The change in contract duration was a necessary step - we were forced to change the contract terms due to the market changes outside of our control. There is a global shortage of hardware and the manufacturers have overflowing orders.
Changing prices for products (in this case - for contracts) is normal practice, which is determined by the acquisition of new equipment, demand, market situation etc. and is done by many companies.