I'm sorry that you got scammed. It always sucks to lose money in such way. There was few red flags about this seller - red trust ratings, locked self-moderated topic, no positive reviews. But probably you visited that thread without being logged in and didn't saw red trust and you also wasn't aware about other things which makes that seller untrustworthy.
And now forum is full of fake IPTV sellers posting from Newbie account. I'm not sure is it same person or no. They have different websites, but their writting styles looks very similar. They don't deliver IPTV playlist after payment like happened to OP. Or they are selling fake stuff - they have collected thousands of channels from public resources. Half of these channels don't work at all or stop working few days after payment was made. So, it's better to pay few $ more, but buy IPTV from trusted provider who gives good service.
- Hide to guests threads posted by users with negative trust
Good suggestions, it should be implemented ASAP because many unregistered users get scammed on Bitcointalk, but I disagree about this point.