I've noticed within the "Forum Gold FAQ" when purchasing fg, you have to spend a minimum $10 US.
My suggestion is to add a currency calculator, to show what the minimum is to spend in your particular currency.
For example, I went to buy $10 AUD today worth of FG, little to realise $13.70 come out of my account, it's really no big deal, but those bigger purchases will have a bigger difference. So having a calculator there would be pretty handy!

If you are not sure on curencies it literally takes five seconds to google one, this is not needed on jsp imo

Also when making a suggestion you should always add a poll

But leaving pages and new tabs are just so annoying
And haha all over it!

the rate at which you get for your fg purchase is not determined by current live currency conversions or d2jsp. its determined by paypal, as far as i know (i actually haven't looked), paypal does not have an api or feed which provides retailers with their in-house conversion rates, so in practice this is not possible (again, i haven't done any research on this). however, i do like your suggestion and i feel if it were possible, users would benefit from it.