Not true at all. I have been trusted to buy bills of GP that could have easily been refunded. I have sold an account on sythe and I have been trusted with over 1B gp from a trusted service provider.
i dont wanna turn this into an argument but 90% of us buy xp/gp daily doesnt make us trusted.... in fact it makes them trusted not the buyer. vouches should be from selling not buying IMO. lets not argue though goodluck on your sales.