I think you will find the answer to that question is NO.

Would you think it fair if Emirates were to put a surcharge on tickets already purchased because they were putting prices up?

Prices do fluctuate due to currency exchange rates, cost of fuel and other running costs, also different categories of tickets become available and withdrawn dependant on sales volume/loads to maximise profitability.

Regarding the prise promise it is for tickets sold by Emirates on-line where the purchaser finds some other website selling the same ticket cheaper. http://www.emirates.com/uk/english/p...guarantee.aspx