corn farmers, empty lots

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is there anything i can do with empty lots? how do i know if one lot is better than another? on craiglist there are hundreds of people trying to sell lots and am wondering if it is anything special and how to wholesale them.  along with that,

one of my leads is a guy trying to sell a 3 acre farm and was wondering if anyone is a farmer and makes money off of corn? one of my mentors said that anyone who doesnt make money off of corn is a jack*** because of all the government subsidies and stuff. he explained the whole process of how to make money on it. so now i am wondering, how much land would one need to start making money off of a corn farm?