Great thanks for looking for confirmation on that point, and again for raising it in the first place!
To answer the other commenter, with 6 erupters at just over 2gh/s it's making about 0.04BTC per day at present but I can't realistically expect to see any ROI financially given increasing hashrates and difficulty.
Other than eBay, where the USB Erupters are over priced, is there another site or place that sells them for less? If I may ask, where did you get yours from, and did you use BTC to pay for them?
Thanks!