Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Rip Off

&#65279;This book is a rip off. It's basically an extra large print 94 page infomercial for whoever ponies up to the publisher. Here's the gimmick. The author goes on and on about the dangers of indoor pollution and all the harm it can cause and states along with anonymous testimonials that the author has found the solution. The number to call to order the "solution" which is an un-named air purifier can be found on the last page of the book. No where does the name of the air purifier manufacturer appear in the body of the book. In fact it didn't appear on the last page of my book either where the words "your sticker here" appeared. Apparently, manufacturers are to pay for the right to have their product's name appear on a sticker placed on the last page. I guess no one paid for the right for the book I bought. This book should not be sold by Amazon.