These days I think Google is skim reading... ie.: the surface of a site rather than the depth. Results in quicker returns for searches and only goes deep when an exact uri applies. To tell the truth, I'm dang surprised that G, B or Y can actually return any results considering several hundred million webmasters are churning out several trillion pages year on year... and am equally surprised that the webmasters are miffed that their "golden content" has been replicated hundreds of thousand times, even if they created it brand new. After all, how many ways can you describe:
At some point, in the algo, there will be a decision of "enough is enough" and no benefit to (our ads showing) displaying more... and, more importantly, how many consumers actually even know about the site: operator and would use it? Geeky webmasters need not apply...
In literature there are seven stories (recently upgraded to ten) and every story involves those thematics. Websites fall into equally limited categories (obviously not as many as 10)... and the language used on those pages does as well.
Rather than attempting to list 100,000 pages in the SEs I'd rather have 10 solid landing pages really high in the SERPs... with compelling content sufficient to get the visitor to continue clicking ON MY SITE. I keep them by interest, not by search alone...
Pretty sure the SEs are of the same opinion as in: "These pages work, but more of the same is not better, so show this many and no more. Move along, nothing to see here..."
Rambling, I know, apologies extended.