Syndicate

The trade is even on expectation, which is the honest starting point. Twenty-five people putting in £4 each buy £100 of tickets, which is 50 lines in a £2 game. On their own, £4 would have bought two lines. The group's chance of holding a jackpot line is 25 times a member's solo chance, and each member's share of that jackpot is a twenty-fifth. The two cancel out.

What changes is the shape of the outcome, not its average. A syndicate wins something far more often, because 50 lines reach the small tiers regularly, and it almost never delivers a life-changing sum to one person. Groups that run for years mostly experience the lottery as a modest recurring cost with occasional small returns, which is a different experience from buying two lines alone.

The failures are almost never mathematical. They are about who paid this week, who bought the tickets, who holds them, and what happens when someone leaves. Write it down before you play. A short agreement naming every member, the stake each pays, the draws covered, who buys, where the tickets are kept and how prizes are divided settles the arguments that otherwise arrive with the money. Several operators publish a template for exactly this.