Found it.
http://www.autoweek.com/apps/pbcs.dl.../60522015/1041
Quote:
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But success has brought a fresh dilemma: In an effort to hit sales targets, would Scion go mainstream? Today, the brand's answer is clearly no. Scion executives say they have no plans to break the 160,000-unit barrier, for fear of oversaturating the brand.
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There's some more quotes in there. It's an older article but it's what the brand is/was about. The general idea is that Scion isn't mainstream and is intended to be smaller.
Hence Scion != Quantity.
In this sense, the FR-S being released as a Scion makes it acceptable to have lower sales in America, because that is what Scion expects. The lower sales Scion is making, from their perspective, are the smaller percents that would have never been part of the bigger sales numbers of Toyota in the first place.