I sent them 1 BTC almost 48 hours when they said they would answer back within 24 hours. I observed it for 5 days during which it appeared as "verified" in the Hidden Wiki and didn't go down or something. So I took my chances and sent an amount I was willing to risk with the possibility of losing it. Here I am, warning others and most importantly: the moderators. Just the next day after I sent the BTC, the "verified" label was removed. I was as patient as I could before trying it and it surely seems like a scam.
Your first mistake was trusting anything on the Hidden Wiki.