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Hey! It seems that you already have the correct answer: "It is a punch of useless content.", "now it is better to focus on your product site or create 1 good websites rather than a network of sites". Content without added value means useless, and therefore outranked by better sites.

I have put my site in copyscape.com for a full duplicate content check... there are 2 pages duplicate... oops I remember those... the legal policy I was bored to write and sorry sorry got too much from other sites but my fault... i was just too lazy for that page... then you small things.... but over all it is no more than 5% to 10% or even less... http://www.copyscape.com/probrowse.php?u=sandyallain&c=eed7840&batch=1&l=1 should I be worry ?

I find lots of dupe content too. Instead of building 30 sites I would focus on one, filling it full of high quality, original, substantive content. Actually, I don't think that I would make a travel site like these because I don't have the resources to compete and the ability to produce fantastic content for cities around the world. Lots of people see the sites of an industry ranking well in the search results.  Then when they try to make their own site or a clients they discover that they can't rank.  That's because they have zero authority and no power. it is worth it or better stop this project and focus on 1 product oriented website ? That is what I would be doing. is affiliate marketing dead in 2013 now? AM has been really hard for several years unless you have a heavyweight site.  You can no longer toss up a site with grabbed content - or even original content and get traction in an industry as competitive as travel. or my writers heh... you gotta keep an eye on these guys.

Take a look at this White Board Friday video, it is relevant to the travel industry and contains some good ideas about content and what 'not' to do since Penguin. It may also help with idea generation! http://www.seomoz.org/blog/smarter-internal-linking-whiteboard-friday