I play RO since 2002, at around 2004, account hack rising in pRO (around 50-150 complaints about hack per day). All people i know playing RO, they told me their account were hacked. Only left the character and some of them character were also deleted.
but I never got hacked even once in RO. I used maximum characters for user and password ( random letter and number which makes me memorize it).
around 2004, pRO lowered the maximum character you can input so by that time, people can access an account up to that limit but my account still can access over the limit which hacker will not even brother it.