Ball comes out on October 1st say for example. If the ball is not a great seller, usually they will discontinue it by October 1st of next year, when they replace it with something that will hopefully sell better than that one. Companies are always trying to get an edge by releasing a ball with one core/cover combo, then a month or 2 later, releasing the same ball with a different cover and maybe a slight tweak to the core. After doing this with 3-4 balls (reactive solid/pearl, particle solid/pearl), they come out with a new ball with a new core and maybe an old cover and start the process all over again. With so many companies out there and so many balls to choose from, the market is flooded and for one company to stay with the reset of the competition, they will immedaitely drop one ball or line off of their current offerings to make room for the new stuff that will hopefully get them more sales and more $$$. Look at how many V2's and/or Vortex's have come and gone in the last 4 years since the V2 Solid came out:
Vortex 1
Vortex 3 TPS
V2 Pearl
V2 Particle
Vortex Afterburner
V2 Dry
Soon will be the V2 Clean followed by the V2 Strong I am sure once they come up with other covers that will "create" a new ball.
Its all how they sell; a lot and they stay, not a lot and they go as soon as they can be replaced.
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I've laid more pipe in this town than Wabasha Plumbing Company!