Scrapebox AA Lists Free-For-All Good?

Question for the more experienced Scrapebox users here...

I'm relatively new to SB, but once an AA list is shared freely here and on other download sites
(I typically see the same lists here as on other dl sites... not sure which is the source),
doesn't it quickly become worthless?

When everyone has it and spams the crap out of the links, at what point do the pages become
disregarded as linkfarms by SEs (too many OBL, bad neighborhood keywords, etc.), especially after the panda update?

Are you better off learning as much as you can about footprints and finding your own AA lists,
or perhaps buying limited issue lists from reputable sellers, than going after the freely shared ones?

Knowing your thoughts on this will help me, and hopefully others, be more efficient in our backlink building efforts.

Thanks

I would always recommend creating your own lists. most of the freely available lists are spammed up and there is no point submitting your link in the page which already has 100's of backlinks. using time option in scrapebox will help to get your hands on fresh blog posts which has fewer number of links and as per my experience those are your best bet if they have some relatively good PR along with less number of OBL's