Hi
I found this as a persons experience however they could have that experience due to them not knowing what is going on.
Yahoo! Answers - Walnut tree did not produce walnuts?
What I also found out was that pollination affects crop yield.
Too much is as bad as not enough.
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Too much pollen reduces the set on walnut by causing pistillate flower abscission (PFA). Some varieties (e.g., Serr) are more susceptible to PFA than others. It has been conclusively demonstrated that if too much walnut pollen is available, pistillate flowers can abscise. This phenomenon puzzled California researchers for years because emphasis was always placed on the importance of maximizing pollination for walnuts (and most other tree crops).
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Acotanc-2001 Paper -- Traynor: Tree Crop Pollination in California --------------------
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When grown for nuts care must be taken to select cultivars that are compatible for pollination purposes, although some cultivars are marketed as "self fertile" they will generally fruit better with a different pollination partner.
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Walnut - Wikipedia, the free encyclopedia
Hope this helps.