I completely agree...the 'bestselling books' are simply overpriced and usually not so good in general - you can tell just by looking at how long they actually stay in the chart -majority are kicked out in 3 weeks
also, almost always I see those books which are not bestsellers yet (published 1-2 days ago) as featured on ebookwebsites - meaning they are simply only the promoted ones which we buy as we have no idea what else to read...well well
