Because the ROI when you make a quality product will make you more money than making a bunch of products that will be discontinued in 6 months. The cost to make a new core and R&D is stupid high. Make a well thought-out product, and you will make more money than "Let's saturate the market!!"
Na bruh, youth bowling is on the upswing and a lot of these parents are shelling out big bucks to get the latest and greatest.
But there is something to be said for marketing. Joe Consumer sees a HyRoad on the shelf, hear it's a great ball, and goes to buy it next season.
They also hear that the Break is a great ball, but by the time normal people get around to buying a ball (not us junkies who probably put on our phone calendar the release dates), it's been the Eagle, then the Ops line. Same freaking ball, 3 different names. People don't see it, so they pick something else. Good product shouldn't be renamed. Make a name and stand by it. A Black Break today would sell just as much as it did 9 years ago. Remember Nitros and Turbos and Rhinos and Thunders? The name sold it because it had a reputation. Explaining that "this ball is exactly the same ball, just different name" doesn't make the consumer confident.