Okay, thanks for the answers everyone!
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.