Steal what? I've already said several times, the prizes would scale from the top downwards. Tanking would not benefit you and I didn't say that lower levels would actually go to world finals and recieve a trophy. The real life examples were just that, examples of lower leagues recieving prizes. Here, let me give you a very quick rough ideaWhy, so sub aliens can tank rating and steal them from the guys who actually should be in those tiers? Because we both know that’s exactly what will happen. The same way guys would rank to get into 2nd and 3rd split, so they could “win” instead of driving in the lobbies they should have been in by rights. It just gives people another reason to skew the entire thing.
GT1
Top 32 - Go to world Finals & 50 million credits
Remaining top 10% - 45 million credits
11% to 50% - 40 Million
51% to 75% - 35M
75% - 100% - 30M
GT2
Top 10% - 25M
11% to 50% - 20M
51% to 75% - 15M
75% to 100% - 10M
GT3
Top 10% - 8M
11% to 50% - 5M
51% to 75% - 3M
76% to 100% - 1M
Obviously the actual values/prizes would need more than five minutes thought, as would the system in general, I'm just illustrating that tanking wouldn't help you in terms of reward. Would people still tank because they want to say they "won" Tier 2? Probably, but who cares? People genuinely in Tier 2 were going to finish behind them overall either way. You could even leave the GT grouping out of the prizes all together and just go on overall percentile.
I'm sure given a few hours or days PD could come up with a good system.