I see a couple mentions of Sportsbet.io, i agree that its really good, awesome support and payments, but they only allowed me to bet $150 on the soccer game, and it was away team to win, nothing special or really high odds 
one of sportsbet.io staff(or representative) made a response on your thread, have you seen it? they said that you can send them a personal message if you have questions, they also said that they accepted a $1 million bet on the 2022 World Cup, perhaps you can ask them if they'll allow you to bet 5-10k per game. here's the response they made on your thread.
As one of the most recognizable and established operators in the business, Sportsbet.io accepted bets for $1 million on the 2022 World Cup
You can shoot me a Personal Message if you have any questions or if you need help Registering an account
You can shoot me a Personal Message if you have any questions or if you need help Registering an account