No, that's not how it works. There is an exchange rate in there, but we don't set it.
The prices in USD for the different packages during the Platinum Sale are:
30 Platinum USD $2.99
75 Platinum USD $5.99
165 Platinum USD $11.99
600 Platinum USD $29.99
1,700 Platinum USD $54.99
Searching on the current exchange rate from USD to British Pound, shows 1 USD = .63 £
I have no idea what the exchange rate you are seeing for in-app purchase.
If you want to use PayPal and go via the web, the Spacetime Webstore can be found at:
https://store.spacetimestudios.com/WebStore/store.jsp
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