I sometimes doubt about them being informational either. For instance, most of the mommy bloggers speak very high about ebates and similar websites. All they say is that you get $5 sign up bonus. But for someone like me who do not buy online much, it will take several years to make an additional $5 in rewards inorder to be able to claim the original signup bonus. I learnt about this catch after making a purchase and felt deceived.
What annoys me the most is when I added a comment describing the restriction for claiming the signup bonus, it was never published in their blog!! Looks like they are just concerned about getting a couple of people sign up using their reference link. :dunno: