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Avalon doesn't offer this option to scale things down according to one's budget. I believe these sticks would fill the gap for many people out there who don't want to sit for months on an ASIC preorder and don't want to deal with GPU mining at this point. They just need to bring the price down.
Very well said.
I would only like to add that Avalon chips being generally available through the several group buys do fill the gap between (soon obsolete) GPUs and full Avalon units. However, since the smallest currently planned design fits 10 Avalon chips per unit, you're still looking at a 150+ USD / 120+ euro "investment" even then. Had Asicminer priced these USB sticks competitively, they'd been able to fill the low-end niche before DIY Avalon boards become available en masse. They still could, but I doubt that.
I foresee a DIY one-chip Avalon USB module being the thing people want, as it will have a realistic price point instead of this novelty item.