Mabey it will be better with somethinge like a raspberry pie and add USB ports and go for USB-errupters? (USB hub with its own power source ofc)
It would be more profitable, but you'd have to mine altcoins (most likely through a multipool) in order to reach ROI on block erupters. Mining isn't currently a particularly profitable business to get into without substantial capital, AFAIK.
However, if you're looking into mining to learn more about how bitcoin works (like me), a Raspberry Pi with a block erupter or two would be a good way to get started with ASICs.
Thank you for your answer!
Well, this seems really hard to make money through... I thought it would be as easy as just buying USB hubs with alot of erupters, join a pool and bitcoins will slowly but steadily roll in... I guess i was wrong :/