Apart from its contents, the COVERS of Bob Ong's tomes suck terribly. If there's a word to describe the creative mind behind all of the designs, it would be "atrocious." Oh no! I can hear the squeals and shrieks of loyal peons ready to burn my blog to the stake. Such Salemesque mentality is not flattering to the author for such heightened emotions reflect the maturity and rhetoric partiality of its audience. It's all about the design and quality of the books, not the contents however sleep-inducing it may be. Anyhow, if they have been keen in understanding what I wrote, they would appreciate the reality that GOOD book covers SELL well. And by having terribly done covers will do a disservice to the author who slaved for months to write those pages. To see it all go for nothing just because a second-rate hack has monochromatic vision is truly an injustice. Period. If they'll publish it as an limited-edition omnibus with good creamy acid-free paper and French flaps and matte-laminated cover design, people will surely stop and buy it.
However, if it was the author indeed who designed those books, then it becomes another contention altogether.
Here's the NY Times Book Design Blog to give you examples on books that failed and succeed thanks to their catchy covers. And another article why we must judge a book by its cover.