another thing to think about - if you have links to your hubs/LLs on your sites, how do you know surfers aren't coming from those seemingly unproductive LLs, clicking through and bookmarking your site. They may buy later, or buy something else, but you won't know where that particular surfer originally came from.
in my eyes, traffic is traffic & you can never get enough. If you're taking the traffic that may not buy right away and sending them around your network then it's all good
