Why don't you put company logos on the covers of your books? Description Text on the back?
I grew up reading comic books and one thing that always bugged me was the art and logo took a second place seat to the company name, advertising text and stark contrasting bar code. Pack all that on the cover or back, throw in a rather large logo and the art is being drowned by crap. In the end many comic book covers and game books look like a tampon that absorbed too much flow. Too much crap in too small of a place. So, since I sell online and don't have to worry such tiddly piddly vast shat I decided to make covers any way I wanted.

The other reason people put such huge clustered logos/advertising on books is because many magazine, book and comic book shelves you can only see the top 1/2 of the book. So this provides the afformentioned brand recognition and easy to recognize titles if only part of the book is showing. (Good stores do not use crappy shelves that hide part of the book cover) So if I make a series of books without shit everywhere then screw it. Fun.

I don't have advertisement text on the outside of the book or even the inside so the only way to quickly figure out what the game is about is to read it, browse the site or word of mouth. I'm not into putting "This is what the game is about, duh duh duh duh."

If someone is too stupid to figure out what a book with tons of art in it is about, by flipping through it's contents (ie previewing the book!) then do you really want that individual as a customer? I can see where it would be semi useful for books with no art ie novels and the like but otherwise it's a pretty moot point. Plus all my product is online where I explain everything so... Yeah.

I treat my products like a movie, you know the deal now kick back and watch the reel.

Why do you waste pages in your book with full page art spreads, oversized border graphics and unnecessary art?
Because I want to. If I want to waste 50 solid white blank pages in a book I'll do it every time straight up. If you want a cheap slapped together text pamphlet make it yourself. Anyone can make that. Anyone can write a book. I make my books because I hate the afforementioned product. So my answer is, "I get freaky because I can." If I couldn't, then I wouldn't be doing this. What would be the point in making toilet paper with text on it? It's not a novel or technical manual, it's a WAR GAME!

Full or Dual Page Art Spreads
If the art is tight then you got to present it right. It always bugged me when I see some cool art and due to "layout" they squeeze the picture into a quarter of the overall page. Great now it's filler. I let my border graphics do the filling so everything else is presented right and tight like a frame on the wall.

Oversized Border Art
That is just a personal preference on my part. What I like doing is:
1. Take a page of text you would find in any average size novel.
2. Center it on a larger page.
3. Clearly divide any non-related concepts so a browsing eye might catch them on the fly.
4. Surround edge of page with great book graphics like a decked out picture frame bringing focus on the center body of content.
5. DONE. From edge to edge I like to beautify and exemplify making everything superfly.

But I find game books with a emphasis on text acceptable.
If it works for you great, more power to you. It won't even raise my eyebrow so I do differently. If you don't like my over inflated artsy crap go somewhere else. To each his own. No biggie.