Doesn't it simply make it cheaper for those who are accustomed to paying in euros? If the price is $40, they would pay EUR 25 or so, and have to decide whether to spend it on a meal or BB,
It works the opposite way for supporter in HT. When I started playing HT it was just after the introduction of euro cash, and the USD and EUR were about at parity, so EUR 25 was roughly $25. Now, I have to decide whether I want to spend $40 to renew HT supporter.