I think it's SUPER obvious that for 0.6 BTC a month, NO ONE in their sane mind would scam and remove signature after payment, especially people with 1200+ posts...  The fact that being new, he won't pay first, shows that this is a scam 100%.  I mean, even after first month if he paid first, people would accept him paying second, as he'd have enough or a reputation built just from that!