It is possible to become a millionaire thru sports betting of course. But it's not going to be easy. There is not such thing as easy money in this world including sports betting. Unless you bet your lifetime savings of $500k with a 50% chances of winning for a chance to become a millionaire. But no non-millionaire will do it because the risk is just too high.

In the end, the best way to become a millionaire in sports betting is to bet smalls amounts and in a parlay. It is difficult to win but who knows, it could be better than to bet in the lottery.