The main reason I thought it would be of benefit was to get those links from directorys using dmoz.

Are these considered quality links? since I did some reasearch on the keyword for "gadgets" and found that the top site www.gadgets.com most of it's backlinks were from these type of directorys.

but is their high ranking like this because their domain is their keyword?

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Gadgets, MP3 players & Radio controlled toys UK gadget shop