I see a lot of rigs with multiple Block Erupters, and tons of USB hubs. Well I have 2 Block Erupters that I picked up for fooling around and testing CraPE with, but I doubt I'll ever mine what they cost back and make a positive ROI. I really think people throw that term "ROI" around without even knowing what it means, but that's another topic for another matter.
Anyways, here's my 90GH/s. It would take over 250 Block Erupters to get the same speed, and these 2 use less than 400W combined! I got another 60GH/s coming soon, and another 60GH/s that was a later order.
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I got late in the game and ordered from BFL too, ended up trading my ls and sc for a monarch on the first day they started accepting orders for the card, seemed my best option to get my money back. Getting in early is extremly valuable in this game if you have reasonable gh/$ ratio. Like you I don't see how is it that so many people buy BEs that most likely never make a positive ROI.
Happy mining!