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Dude, I'm level 14. If I'm telling you it's the exact same thing, it's because I've done it many times. There's nothing new about this.
The difference is that instead of going directly from 1000 to 3000 seats, you upgrade in steps of 500. It'll be 1000>1500>2000>2500>3000 and you can earn more revenue in the meantime, while spreading the costs over the season.
Building the stadium in one go is for people who don't visit the game everyday. Read tarcanes92's guide.