Yes, I agree because most sites/blogs prefer to exchange link with higher PR. But I think if your blog has great and interesting content, there maybe other sites that will also exchange link with you since they may think that putting their links on your blog will provide them with additional traffic.

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Australian Skilled Visa | Australia Visa Services | Travel Visa to Australia

SU will bring you lots of traffic but you will will see your bounce rate skyrocket. These people are mostly curious and seldom buy or leave a comment.

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Local SEO Solutions Tucson Search Engine Optimization Phoenix SEO

SU is a good site to get short term traffic. I got 900+ visits from them form one of my posts but after a few days its gone. Best thing to do to promote a blog is submit them to blog directories, comment on blogs of the same niche, join blog communities and forums, use social bookmarking sites, write articles and submit them to article sites. Those are some ways you can do to promote your blog.

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Web Site Design and SEO | Web Designer Pinoy
Web Design and SEO