Only 45% of the original price? The majority of other users sell AWS codes at 20%, and there are also plenty who sell as low as 10%, occasionally even lower. You're not going to get much business because this is a horrible deal, sorry.
And how are the EDU codes risky? I haven't heard of anyone having problems with them, including me. I've used more than 10 of them without a hassle.
Fortunately, I've been pretty smart about who I buy from so I haven't been scammed yet. People with brand new accounts, zero/negative feedback, or have their topic set to self-moderated are blatant red flags. I'm going to look elsewhere but might come back if the price is reduced to a reasonable one (<20%).