Why is it, that the larger the computer monitor, the higher its native resolution?

I like having more screen “real estate”, but while I was hoping to see more of given page (like when reading newspapers online) and reduce the amount of scrolling I need to do, very often all that happens is that the letters are smaller, that is, the text is smaller. I don’t get any more information appearing on the screen than on a smaller monitor.

I understand how the letters are smaller as a result of the higher resolution, but I was wondering why do screen manufacturers do this? Why not just make the screens bigger, but keep the same dpi?