I think that issue here is four-fold. First, companies know that most bowlers want to see hook, so even the entry-level stuff is getting stronger and stronger all of the time in order to accommodate that. Secondly, most bowlers only bowl on THS all of the time, and the THS doesn't really showcase the different potentials of a lot of bowling balls. In fact, on most THS, you can get to the pocket from near the same line using a No Rules or a Punch Out. Third, many bowlers completely misunderstand ball motion. They don't realize that most "weaker" balls store all of their energy for the backend while "strong" balls often use energy early. Pair that with a house shot without the volume to hold up the strong ball, and you'll quickly find that Punch Out hooking circles around the No Rules, and then you have bowlers complaining. Lastly, going back to the point from No. 1, since bowlers want hook, companies keep using stronger and stronger covers and cores in their top lines. Whenever a new one comes out, they move the previous high end materials down into the middle or entry level slots, which makes many of those balls stronger by nature.