I think what he needs is a platform that is reliable and safe enough for him to do his deals, him saying
maybe a middleman with bitcoin talk is better
my dear even here wont guarantee him that 100% trust his looking for, scammers are all over the internet and they wont stop till they have what they want and even at that, they
WONT STOP.
Here the platform is not issue its about the
mode of payment since the nature of gift card is unable to validate until it gets redeem so if OP wants to continue the trades then he needs to choose multiple modes of payments I mean accepting or selling so he can get his customers first which will built his trust also he can find who is trusted enough to trade in future even with modes that is possible to chargeback.
To mitigate the risks of scammers in bitcointalk then the user needs to choose certain criteria for who is going to trade with like
- Never deal with throwaway accounts unless they are willing to escrow (only irreversible payments)
- Don't communicate outside the platform to avoid impersonators.
- Trade with established members of higher trust level to ensure they won't scam you.