True, but these are fun to use at so called luck / dice pools.
These miners use very little energy (5~10 watt). You can let them running for months on a solo pool and see if you are lucky to hit a block.
My favorite pool for this miner:
http://ltc.tbdice.org/If you hit a block you'll get 25 LTC at once

It is like gambling.
They are also great to learn/start mining. Plug and play.