... but all of my medium oil equipment is is starting to act the same. (dull balls shining, shiny balls dulling, etc). ...
Do you take care of them properly:
- Refresh the surface when needed (every 15 - 25 games)
- Do an oil extraction every 50 - 75 games?
- Clean them after every session?
- Do a deep cleaning with Clean and Dull or Hook-It every 12 - 18 games?
- Do a thorough resurface every 50 - 100 games?
If so, you may feel less of a need for a new ball.
Balls can be very expensive today. Minimal maintenance will often allow a ball to remain useful for 250 - 400 games. You may get tired of looking at them before many balls will outlive their usefulness.