Don't bother with them if they require a backlink. If you are happy with a website, you should give a link as a "vote" for the site. For example, if you submit to my directory and are happy with the result, you could give a link "out of the goodness of your heart".
Time is money, so don't waste your time reciprocating when there are thousands of other sources. If your site is quality, directories should be thrilled to link to you.
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