
An intrepid explorer on the RuneScape forums came across an interesting update to Jagex’s Terms of Service. Specifically, Jagex’s virtual currency (Runecoins) expire three months after purchase.
Virtual currency expires and will be deleted if it has not been redeemed within a certain period after acquisition so you should redeem it as soon as possible. The expiry period is whatever we specify when you acquire the virtual currency or, if we haven’t specified a time limit, three months from acquisition.
Heading on to the forums, players asked if this was simply Jagex covering their backs or if the developer actually intends on allowing a player’s purchased coins to expire. Mod Crow responded to this thread with a confirmation that, while Jagex has not enforced the policy, they “reserve the right to have virtual currencies and items expire after a period of time.”

(Source: RuneScape Forums)