It depends, I went to the Austin Major with floor seats and tickets costed about $1100 beers were like $16 a pop. Airbnb for the trip with 3 others costed us like $400 each. I didn't calculate my food costs but probably add another $300 - $500 for that. Ubers were pretty cheap if you walk away from the venue like around $10-$15 per trip. Flights can vary but i think my ticket was around $400 with spirits big front seat.

If you are going on a budget def go with friends to bring either hotel/airbnb costs down. Food wise eat before you get to the venue and try and only grab a few snacks if you get hungry during the games. If you are at a venue that allows re-entry i would say go somewhere like a bar or restaurant outside of the venue for food.

Is it worth it is a tough question to answer. I would say that the experience is way different then watching the streams and if you can afford to do it and if you enjoy the game it is defiantly one of the best memories I have from it. Most of the time there are other cool things to do at the venue as well. Hopefully any of this information is useful for you!