So basically you want $10,000 while if someone offers you $2700 you are so surprised that you call him/her a scammer ?

I believe that's not the right attitude mate, I know he might well be a scammer but first ask for proofs and if the user denies or try to stay out then you can call that way. You are a newbie here and suddenly wants $10000 while not being interested below $2000/per deal makes me doubt you too mate.