Steven. In my experience, adding more whitespace in print is not an issue of production values (print, pages and such), but much more of a conscious brand decision. In my early example, I spoke about a client who wanted to fill all available whitespace. Initially, I thought his motives were because he was paying for it. Now, given that direct mail generally appears more down-market, I’m not so sure that was the case.
So, on the web, just because we can add whitespace, should we? I guess I’m saying that these decisions should be a part of a rationalised design process so the cost to the user is potentially much more than scrolling.