Personally I don't really understand buying all the new balls either. But, I appreciate those who do. They are ready suppliers for the used ball that I buy. In the last year I've bought, maybe, 2 new balls. I've bought, maybe, 10-12 used ones. If you look at my "arsenal" you might laugh. Everything in it is at least one generation removed from current, most is older than that.
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"How can you govern a country which has 246 varieties of cheese?" - Charles De Gaulle
"Government is the Entertainment Division of the military-industrial complex." - Frank Zappa