Before I had 3 pages worth of items in my shop, I averaged 5 - 10 views a day. When I hit 3 pages, my views jumped to 20 - 25 a day. When I hit 55 items, views jumped to 30 - 40 & now with 60+ items, I'm averaging 40 - 50 views a day. Not exactly setting the world on fire, lol, but the views are going up as I increase stock & I haven't done anything differently as far as marketing goes. I do notice, however, that on days where I don't post to my social media sources and don't list anything new in my shop, the views drop dramatically.
I think another reason that no one ever mentions for views going up as you increase your stock is simply that you've been at it longer. You're starting to build your brand, build a following, you participate in teams, & make "friends" through circles & favoring things. Your network of shoppers is growing as you grow your social media following. It's just a natural path that your business takes.