I wonder if anyone at woot had the groupon idea (before groupon came out) but was quashed because it just wasn't woot-like. It seems like woot lost a couple orders of magnitude of scale by (apparently) making themselves the fulfillment bottleneck.
They're both important. I'm never sure I'll use a groupon when I buy it, but I can always be talked into buying a gadget if it's cheap or a shirt if it strikes my fancy.