I would lists down the following but those selling and making these usb miner will not agreed with me. They are only interested in making money from the newbie. So better watch out.

1) YOU WILL NEVER RECOVER YOUR INVESTMENTS

2) YOU ARE ONLY WASTING MONEY BUYING THE USB MINER

3) YOU ARE ONLY INCREASE YOUR POWER BILL

4) DOES NOT LOOK GREAT AS A COLLECTOR ITEM

5) YOU LEARN NOTHING ON BITCOIN MINING USING A USB MINER

6) YOU ARE JUST WASTING YOUR TIME.