If the cost of goods goes up as a result of the dropping dollar value, than the percentage of disposable income that a game represents is increasing. That is, if Joe P. has £100 per week to spend on 'stuff' and that includes £90 of shopping, a £40 game is a month's labour. If the cost of shopping increases to £100 per week due to the exchange rate, that £40 game becomes impossibly expensive. So it's not tied to salary particular, but buying power. As a real example, the price of petrol in the UK is galloping up at an insane rate. People are spending a few hundred pounds more each year on fuel then they were last year. Thus the price of games is going up in relative terms of how much money people have to spend on things they'd enjoy.