Payment rates have been adjusted due to the rise in price of 1 Bitcoin. New rates will apply after your next payout.
Will the rate change if bitcoin price returns to 300-350 USD ? I always thought that bit-x takes profit from its business in btc, making it
immune to price changes. Anyways, the price could very well fall back to where it was tanked from even faster than it went up..
Still there are other expenses that needs to be paid in fiat so yes, I think it would just be right to do just that.