OK my understanding on this is your existing sea fight account can not use wild coins if you did not sign it up to sea fight via wild tangent .
1: sign up to
and select the country you want.
2: buy your wild coins
3 :via the wild tangent web site select Seafight .
4 :sign up new account to sea fight and select the country you want your account to be on.
5 :Your new sea fight account is now linked to wild tangent it will show wild tangent just below the sea fight logo you can now use wild coins on your new account.
6: Big point have stopped all players using wild coins in the game unless the player signed up to sea fight via the wild tangent web site .
7: 5000 pearls cost $1.99 USD = $2.38 NZD for $6.80 NZD you get 20 WildCoins it costs 8 wild coins for 5000 pearls.
Hope this helps