So the current issue with the point raffle is, that it allows you to buy unlimited amount of tickets, allowing someone to keep buying overwhelming amount of tickets to keep raking in the points (unless stricken with incredible bad luck or someone willing to risk their own wealth to stop that guy). At the same time, simply putting a hard limit would take away that sense of freedom from raffle. Therefore, I propose a player could buy tickets until he would hold a percentage value (for example 40%) of total tickets in play, there would of course be the minimum for maximum amount of tickets a player could hold (for example 50).

Hmm, good point. I like that idea. Shouldn't be too difficult to implement.