Is 30k enough to pay a team of people who know how to run a large scale website, optimize it, monitor it 24 hours a day, ...? It is definitely not.
Besides your starting funds you have to keep in mind that the competition on the esports betting market is getting stronger and stronger. Take a look at sportsbet. They are one of the best betting sites out there in my opinion and they offer esports betting, too. This leads to the fact that your site has to offer a unique selling point Sportsbet doesn't have to get players to leave Sportsbet in the favour of your site. This is definitely a tough challenge requiring a lot of money (development costs, advertisement, ...).