Greg,
Bottom line, MoRich covers are/were made by Brunswick and Columbia; they are no better or worse than Ebonite covers. Some Ebo may absorb at a higher rate than other manufacturers.
In today's environment, all balls MUST be cleaned IMMEDIATELY after use and before putting them back into the bag. That is the only way they will last. All will need some kind of treatment in the 50 - 250 game range, depending on many factors: dullness of surface, amount of oil bowled upon, rev rate, roughness of the lane surface, etc.
I'd venture a guess that most balls can last 500 - 1500 games, if properly cared for.
I agree with several others here that Visionary and Lanemasters are the standouts, the longest lasting and most durable with the least care necessary, but they still need to be cared for.
Cmoore,
I am sorry you had a problem with your Haus machine. I can change the surface on any Lanemasters/Legends balls with my home spinner with sandpaper, Abralon or if necessary, Trizact pads. The hardest to do so far was the Masterpiece, a resin pearl; I needed to use Trizact on it to get a ball reaction change. Most times, I have found that polish or sandpaper make significant changes to the ball's reaction.
Sorry also that you were not able to use Lanemasters balls to keep your avg. at 234; I guess you needed the backend help from the MoRich cores to do that. I wish I could average 230. Congratulations. That's impressive anywhere.
MoRich may be King for you, just not for everyone.
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"None are so blind as those who will not see."
Worrying is like rocking in a rocking chair: it gives you something to do, but doesn't get you anywhere!"