why is the tick value fixed ? for ex. usd/chf tick value = (0.0001 / 0.9176) * 10 000 USD = 1.0898 $ . so I get 1.0898 $ for 1 tick say i got 5 ticks .. so in total i made 5 * 1.0898 $ what if the curreny exchange rate changes, would my tick value ...