It was a popular ball at the time. There is a lot of talk about todays oils and everything else, but I think this is mostly hype for selling super aggressive bowling balls. Most older bowling balls roll great on many of the shots bowlers face today and don't require the bowler to move after a few shots to keep chasing the oil that is burned up so quickly. That is why so many of the entry level bowling balls of today are so popular. Brunswick still uses the PK17 cover from the Zones of 1995 and many other companies use similar older covers on their entry level equipment. The game, the lanes, and the oil haven't changed that much. Only the sales gimmicks.
I've watched a few of the older bowling balls on ebay and if the price is right I may snag another.
"Get out of bowling what you want because that is all there is."