Teasers = more players = more plays = more ads viewed = more cash, right? *nudge nudge*
I'm going to say more AG-oriented and recognized developers are going to do this, while unknown or regular ol developers won't use it, because they haven't heard of it. Either way, when a game is known, someone can ask the developer "hey, go to this link and drop us some lines! Your game will be better known!" It can work out if the conditions are right.