A new addiction or hobby?

right. what is the difference between addiction and hobby? i searched up here and it states that:

addiction : the state of being enslaved to a habit or practice or to something that is psychologically or physically habit-forming, as narcotics, to such an extent that its cessation causes severe trauma.

hobby : an activity or interest pursued for pleasure or relaxation and not as a main occupation

to tell you the truth during the past week, i've been doing a new activity.
i call it as "ebay-ing". :P every time i enter my room, i'd go to my lappy
and type "ebay". that was back then. now, i put ebay's link under my bookmarks toolbar. yesterday, istayed up all night browsing through various items on ebay. whereas today, i think i've opened the homepage more than 20 times! i had also bid on some items and unfortunately [or maybe fortunately?], most of the items, i lost to a much higher bidding! haha. boooo to me! :P just now, when i was doing an online quiz, i opened a new tab and went to ebay when i know i haven't finished answering yet! haih...

so what do you reckon? addiction or hobby?