imo 95% who play f2p aren't playing at ALL to twink...they're playing because its free....we just migrated to twinkinfo because its our only real forum.
Back in the days at last, twinking was about getting the most advantage over your enemies by getting the best gear and enchants possible. But back then you couldn't get all the BiS items cause then you would ding lvl 20 + some items were from the other faction. Therefore you needed a good amount of braincells and luck to get all the best items you could get. The definition of twinking may has changed since that but that is what I see as twinking.
tldr: Getting the highest advantage over your enemies at a specific lvl by getting the best gear / enchants possible.