Depends on the average golfer's game.
Are top of the line golf balls worth the expense to the average golfer? - Page 2
Poll Results: Are top of the line golf balls (Titleist Pro-V1, Bridgestone B330, Callaway Speed Regime) worth the expense to the average golfer?
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Is it worth it to buy a Nike TW shirt over a generic shirt?
Play whatever you feel like playing, but I don't see how an average gamer can gain a lot of strokes from using expensive balls. It's more important to find a ball that fits your game, and I doubt anyone can't find a cheaper one that works.