nevermail, I believe that if surfers stay more on your site once they reach it then it's great.
From SEs point of view ( and it seems just logical to me ) if surfers stay more on a site than it's quality, it has something of value that surfers are interested in, unlike spammy non-quality sites which in most cases get closed in the first 10 seconds or so ( and they can get this data, mostly Google through the toolbar ).
The increased number of bookmarkes is great, don't worry about that, at least I never do when I see more bookmarkers
Don't "hide" the freesites, just make sure that BEFORE the freesites you have some tasty banners/text links to make the surfer click them and give you a chance to make some money
