Along the line, he asked if I will be willing to join a group betting, I asked what group betting was, he told me it's just a group of guys like myself, coming together to join an agreed amount together to bet on chosen sports games, and if the bet wins, we take out the money with the profit and share it equally amongst ourselves.
As the group would had already being gambling together before he invited me I would ask to see how well they have been doing for the other games that they have predicted. If they have good ratings, I can join them but I wouldn't add to the games that they're playing.
I'll just add my money like an investment and allow themt to do their things knowing fully well that if they win, I'll make some money and when they lose, I'll also lose therefore I will not give them a big amount. I would already be gambling myself so if they want my input on the team bet. I can give them some bets that I think will play according to my prediction.
I will be playing my own bets by the side because I can't just depend on them to make it a profit every time that they play. Having two different sources that can generate me income isn't a bad thing although I still know that I can lose both money but it is a risk I don't mind taking.