Just checked bitmain: L3 504Mhs for 2200 USD.
100 x USB miners = 500 Mhs
100 x $80 = $8000
L3+ @ 2200 USD, even if it is a cashed page, is 400% cheaper.
These are meant to be lower cost, power efficient devices to allow/entice/enable new miners an alternative to burning up their video cards. The more people mining, the better.