Comments & trackbacks are critical, it has been explained to me. They give links back to your site, and I'm sure they demonstrate site-related activity, which Google is going to love in addition to the external links.
I'm a member of Blog Success, which very much promotes Wordpress. I originally started with SBI, went to Joomla, then dumped all my work and started over with Wordpress, at which point I really started to fly because I could build content and organize my site easy-peasy. With Wordpress, trackbacks are a cinch. I don't know how they would be handled with SBI...
And to be honest, posting comments is not a waste of time. It reaches you out into your niche community, makes you more visible, helps you build relationships and become aware of what's going on. It builds "social authority" and credibility... all important for business success over the long haul.
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