i contacted rollbit and a few others and they claim the provider increases them as they wish and theyre legit $200 for NCAAF lol
Seriously, they only limit your bet to $200? If that's true, it doesn't sound like the place for high rollers. Maybe you should consider trying out other sportsbooks. I've used sportsbet.io for a single bet of $1,000, and I had no issues withdrawing my winnings. Give it a shot, mate.