bitcoin mining

hello, so me and a friend are in need of extra money so we thought we could do something related with bitcoins.. his parents own a semi big commercial store and we have permanent and free access to the headquarters where we go to play with our noise toys. anyway, there is like 50 or more computers that sit awake everynight when the people who works there goes home. is there something we can do to put that machines to mine day and night? would it be useful? i know the bitcoin bubble is going to pop soon

I'm using 14 usb ASICs and getting 4gh/s. I got them all for around $200. With bitcoin increasing in value, I am essentially making hella dough given my power consumption, which is about 2.6W per chip.