It seems obvious that pouring money into one aspect causes another to be lacking. Eg:
Mass Effect, more graphics > less content
Dragon Age, sh!t graphic > much more content
(content = quests, areas)
Which part don't you understand?
Its not a rule set in stone of course - that because one part is obviously favored that the others will be lackluster. But it makes that option much more likely, given that there isn't such a thing as unlimited time and funds.
Unless of course, you're Duke Nukem.
That's not true - I like table tennis.