How do bookmakers estimate the chances of winning ESL One 2019 in New York?

Odds for WINNERS at ESL One New York 2019 The best course to win the team
1 Astralis 2.5
2 Team Liquid 3.5
3 NRG 9
4 ENCE 13
5 FaZe Clan 20
6 G2 30
7 Optic 100
8 EUnited 500