I've been around the block long enough to know you never take an 'easy profit' deal from someone who is in the business of making money from them while in their own domain.
To make the "free" money and not ruin your life, You must have the discipline to look at things from a purely numbers perspective. It has to be mechanical and not emotional. If some action is +EV, and bet sizing is correct relative to variance, then you should perform the action. Never chase losses with a -EV bet.
The terrible thing about gambling is that there is no limit to how much you can lose, and you can also lose way more money than you actually have. It's a dangerous game.
There's a certain poker quip which I like to use and apply to other contexts, such as active investing: "If you look around the table can't tell which player is the sucker, you're the sucker."
In other words, beware entering into a game where the rules ensure somebody will be victimized. This is especially true when many of the existing denizens spend much much more time and effort and finagling than you'll ever want to match.
"A strange game. The only winning move is not to play." -- W.O.P.R, War Games (1983)
I collected a few grand back then, however those sort of promotions are now illegal where I live.
Laura ingalls wilder said it best, in Farmer Boy:
“never bet your money on another man’s game”