Exactly. Most people (me included) dont want to drag in 6-8 balls when bowling league anymore so they use a 3 ball roller and a 2 ball tote ( or 2 totes in my case) that way they have balls to cover all conditions (just in case there is carrydown, oil machine problem, new shot etc). I bring in a spare ball, particle pearl, reactive solid and a reactive pearl every night. No need for any more than that. 2 ball totes are easier to sell and are much more "space" friendly.
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Unoffical Member of "The Nacion" until I have to shoot a spare (then I join the Team Storm).