Will there be any benefit in promoting the neo or wordlix in the T.E sites?

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While surfing the traffic exchange sites, we are able to see lot of members who are promoting the PTC sites, neobux and wordlinx etc, Will there be any benefit of promoting these sites in the traffic exchange sites? Because the traffic exchanges site members usually well known about the PTC sites.As the above sites are having good record of payments, most of them might have registered with the sites already? Of course, the TEs are the final opportunity of the earning for the online earners by promoting their websites or blogs. In this situation, promoting the well established sites may not help us to get referrals.If the PTC site that they are promoting is new, then there may be some possibility of getting referrals.Are they wasting their earned credits?