The original model asked the player to pick a fixed euro stake, from €0.10 up to €2.00, with each amount tied to a set number of draw tickets and the tiers it qualified for. The redesign replaced that with a percentage of the player's own base bet, from 5% up to 50%, so the contribution scales automatically as bets grow rather than sitting at a flat figure. This was the commercial heart of the project. The percentage model was introduced specifically to lift turnover and average spend per player, and it does that in two ways. It rises with the size of the bet, and it expresses the cost as a percentage rather than a euro amount, which makes the actual cash added to each spin harder to read at a glance than the old fixed figure was. I have been clear about that second point because it is part of why the model performs, and a case study is stronger for naming it.