ive got a guy in my area selling these and ..

http://www.vnbitcoin.org/detailcalculationltc.php?name=LiteCoin_Mining_Rig&startdate=2017-08-07&costperunit=2999&wattperhour=950&gigahazarate=600000&daytoincrease=3&testlopfirst=-0&diffincrement=3.812&bitcoinperdollar=41&electriccostinput=.06&begindifflevel=442592

all the maths ive done suggests buying one of these for LTC will never make positive ROI, what gives? why are you getting excited, what have i missed?