Thanks for all the replies, for a moment I got scared that I missed something
What was the price you quote to sell them? It should be some new users who wish to try mining with USB miners. Bitcoin is getting popular and lot of people wish to earn it by mining. Some of them want to play their part in securing the network. Yes indeed you are lucky because not all people usually go for second hand USB miners. Most of them prefer to have a second hand S7 or big miners.
But it's good to see people trying to get an idea of mining at home with a USB miner at first rather than heading straight to buy a S7.
I didn't have that many of them to begin with, and I would rather not mention the costs.
Lets say that by selling them all I made over ~$150 profit after covering my initial expenses.
I was thinking to pick up the S7 myself, but with the energy it requires I don't think there will be much of a profit in it.