cambrionix 49 port hub. Each port is isolated. $500. I think it is cheaper to get a bunch of RaspPi
http://www.ebay.com/itm/like/251380675091?lpid=82

why not any of those ?

it`s USB 3.0, rPi don`t like it

I want to order that 49 port hub but am cautious because idk if it will work. Should but don't know.