They are looking for incoming link juice, and not sending any out.
Typically you need the link juice coming in, and you do not want to simply cross cancel out the link via straight link back. That is why people do A-B-C linking strategies.
So my guess would be, the link list owner wants 200/0 links coming in, and is not sending out any link love back. Or, perhaps they only provide link juice back on PAID links. There are many ways to approach doing any type of site depending on what your business model, or how you plan to monetize the site.
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Should You Email Your Members?
Link1 | Link2 | Link3
Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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