All sportsbooks have a maximum bet, but it's not really the max bet that matters it's the maximum potential payout. This can be as much asR$250,000 at the best high limit betting sites, while occasionally, it's even higher for those who are in VIP programs.
The betting amount limit on Bet365 can be increased by contacting the customer care services or the site managers. They are the ones who confirm the increase or decrease in the betting limit. The site states that you have to put in a request and upon such request the site will confirm the increase in the betting limit.