Although I do enjoy sandbox settings, some of the biggest companies in the industry are making a killing off highly detailed setting books. Look at the number of campaign setting books put out by Paizo for the Inner Seas, although one book may not detail a ton of specific locations, the culmination of books on the setting make it very detailed and very specific on how each realm in the Golarion setting works. Wizards originally did the same thing with both Forgotten Realm and Eberron. They even sourced out Ravenloft and Dragonlance to other companies that put out a good number of books for each setting and they are still wildly available via ebay or other used venues. We have yet to see where 5th is going and maybe they're doing more sandbox this time, but it's still early. Again I'm not saying sandbox is a bad option, it's just not a common one among the larger companies. For the most part you are not dealing with what I can call advanced gamers who can pull together a setting from the deepest parts of their imaginations, like many novels, everything has to be detailed out in order for them to get a picture of what to do and where to go. Sadly this is a majority of gaming consumers. This basic adventuring type, like something to sink their teeth into that they can pull from, specific characters, the name of the most popular tavern in the capital things like that. While I may not use that kind of information in my own campaigns, most people will. I do agree with the need for adventures. Many people like sitting down with preplanned adventures in a setting they are familiar with as they can really build the events in that specific setting. I find however that they need to be familiar with it and just world building via adventures may not be enough for them. Although the sword and sorcery nature of d100 games like Magic World may not involve grand epics where you need to parlay with various kings and princes, many gaming consumers will want to know these things so that they don't have to think them up themselves and also make them more comfortable with the setting as a whole.