@ Nemo, I think the current cost per port is 0 if buying 50 units...
This is so untrue. Nothing is free. Instead of giving you a quantity discount for buying 50 they are applying the savings to the cost of Hub. This just makes it harder to see the actual cost.
BUT WAIT, THERE'S MORE!!!
These come with out power supplies, so you need to figure in the cost of a power supply when figuring the per port costs as well.
"Free with purchase" is never Free.