Heh now THAT would be a “magnificent bastard” move, but according to notes the account profile was last updated in April 08 well before Palin was even in the running for VP pick.
Profiles are immaterial...I have a yahoo acct that had 4000 emails last time a looked, almost all spam. I never use it, but if I need an email address for something without giving my current I use it. Sometimes you need a buffer acct...that may have been active at one time.