I mean its nice of course. But I just can't see arriving at the alley with that many balls. If its a THS the shot is pretty much the same every week. Do the lanes change that much that people need all of these balls. I can see if your doing PBA Experience or bowling in regionals, then maybe bring some extra balls, but if your bowling a THS I just don't think its necessary. I bring my 3 balls: Storm Shift, Vapor Zone and Maxim Spare Ball. And I haven't used the Vapor in forever. I just change my line with the Shift, its not difficult. But I do remember when I carried alot of balls with me, my game suffered. Every time I threw a bad shot, I changed balls and eventually thought I needed a new one. It was just bad, my game got much better when i focused on one ball and used that, I usually stay with my Shift all night long, unless it gets really dry then I try a Blazing Inferno. But thats just me. Enjoy.
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Arsenal:

Storm Shift
Vapor Zone
Maxim Captain Midnight

funny guys.. For my regular THS league ill bring
Black Widow
Cherry Vibe
Spare

And usually another ball just nothing has a perminent spot yet. A few of the balls are specialty balls really like the nebula i really only use in tournys or when the backends are super clean or alot of carrydown. Gargoyle is for one house that i bowl my HS league at were they can get bone dry. Secret Agent is for oil in early game blocks of tournys.
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Chris