Of course, each and every blogger (including me) would like to guest post only when he gets something in return. But yes, product placement is not considered a guest post because it is direct selling.
Mostly, people do guest posting because of backlinks from your site to their sites. Or they can post tutorials about their products if they have. So you really need to think something fruitful about your guest bloggers otherwise it is better to write blog posts on my own blog only.
The best way to find guest bloggers only goes through your blog. So create a big and bright link on your blog to welcome guest bloggers.
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