I think more posts should be required before allowing access to other forums. Not because it doesn't mean they are a scammer.. but because it gives you more to look at in their previous posts to give a possibly better indication of what they may be all about.
I did not think of doing this until AFTER i bought these 3 singles (yes i was the other idiot) - and after reading his posts i see that he said in one he was doing some bitcoin project then in another that he was getting out of it. I probably would have been more cautious. At least i paid with paypal (and i have opened a dispute to lock the funds - did it really quick after seing Bogarts post).