$3000 for an Amazon Guru

someone i know told me his is starting his business selling via Amazon. I was excited for him and was asking what he was planning on selling etc to which he replied he will find products that has more than 300 sales a month and start selling these. i was a bit shocked to say the least, knowing selling on Amazon is not an easy game but thought maybe he might be onto something. I pressed a bit more about strategy, analysing sales trend, how he will boost his listings etc but got told it won’t matter to him at all.

He is a real nice guy, not very tech and business savvy unfortunately and eventually told me he paid $3000 for an Amazon selling coach and the coach asked them to download some paid apps that gives the data on sales profits margin etc and from there choose any product they would want to sell and start selling and find the ones with 300 sales and above.

Is there anyway he can actually make a some money off Amazon to at least break even with that sort of strategy?