Yes really it is not big amount for me. Just for testing only i have done small trade. Whether he is genuine or scammer.
At least you have learned your session. So maybe you will be more aware in the future during trading. Two things you ignore during trading with this guy. As I see the user has negative feedback before making the trade, You did not care of it. Again you did not use escrow. If you were care of this two things maybe you could save your 50$.