Let's reward players from stealing chunks. We'll now drop XP orbs on them when the do. Each firework we fire gives about 1 levels worth, so when the first captured chunk brings you to 2, with 4 fireworks and 4 levels- and it costs 5 to make the snowball that you need to do it.

But the next one gets you to 3, with 9 fireworks and 9 levels. Then 4, with 16 fireworks, 15 levels, etc etc etc. The cap is at 500 fireworks and 500 levels.