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First of all: are you seeing any conversions?
Hotbar has a weird way of diplaying your listings. In fact its probably not really what you are looking for when you pay per click. But the traffic is correct from hotbar. They have a sh** load of users.
As for ABC Search I would be careful. They will eat up your big keywords and bids. Have not found any fraudulent traffic yet but I am keeping my eyes on it.
Anyway I have experienced low ROI with both of the sites.
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