Let’s go
I paid for the base game and if I want play the expansion, I have paying.
I pay $ 49.90 (base) +49.90 (exp) = $ 99.80
How do I upgrade my account?
You can upgrade your account to Heart of Thorns in-game or by applying a serial code (from buy.guildwars2.com or one of our official retail partners) to your account on the account management page.
(Information withdrawing of the https://help.guildwars2.com/entries/95982157)
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Require refound – $49,90(base acc)
You get free account + $49,90 hot (used your refund) = full account, half price.
Very nice ArenaNet -You thought the older players