Unfortunately I must agree with you that I didn't do enough research and didn't ask enough questions, lesson learned.
On the other hand I must say that the way they do thing seems to me a little up-side-down. Apparently it is ok with them to buy a phone use it for testing and get the refund for the phone and the SIM cards when you reached your decision, however it is not ok to refund just SIM card. Considering that the returned phone they should sell as used after it has been returned back to store, it seems to me like they are loosing twice in this case - on the SIM card and on the phone. That's just me, wind apparently thinks differently.