Block erupters are not profitable.
Yes I know that, I'm not buying them to make ROI solely from them. Maybe you should re read the post.
Why do you want to buy so many BEs then? If you don't want to make ROI, make money, then what do you want to do?
Is the rationale of starting a bitcoin based business with an interest in investing and mining, to actually have bitcoins? If you think yes then I think you can follow my logic when I stated: I am fully committed to starting a bitcoin mining/investment/useable tech company for southern Africa.
That means having a viable means of generating bitcoin, even if it is below ROI.
Hope that answers.
Edit:
Please also notice that I mentioned USB BE's OR 2 Blades, not both. I think it goes without saying that I would prefer to purchase blades.