this is what I call a smart way of scam people.. but smarter peoples won't get scammed with this trick. they will see and confirm everything before completing the deal.
sorry for you lose mate.
My worst experience with bitcoin is when I was using faucets to earn bitcoin. I claim every faucet in landofbitcoin list and do this almost for 1 month constantly for 5 hours a day(in 2014) and I didn't even make 1 dollar after the end of the month. I was almost decide to leave bitcoin forever. but then I decide to try trading. and now I am here.
I won't forget that period of my bitcoin life.
I was going to leave bitcoin too when i saw that you cant so anything with the money earned from the faucets, but at the beginning the reward pretty much higher comparing with todays awards. Best practice is waiting for at least one confirmation then delivering the item.