I just recieved the same email from D*y J*b K*ll*r and from what I have read on this thread I'd be pretty dubious about purchasing that ebook.
Possible scenarios:
1. the ebook is legit and probably worth what they want for it
2. it's a scam and is relying on the greed of people wanting someting for nothing albeit the $197 tag which SOME people would pay IF they thought they could get more value for free.
3. there is a more sinister motive behind it. perhaps the D*y J*b K*ll*r people have been burned (ie. illegal downloads of their stuff) and they are trying to entrap unsuspecting blackhatters
4. D*y J*b K*ll*r peeps have nothing to do with it and somebody is trying to make a quick buck
5. Cl*ckb*ank themselves have set a trap to catch download opportunists
6. none of the above

On the other hand I might be reading more into this than I should. if that is the case I'm crawling back under my rock.