Great record here, congrats Dr!
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Can you share which are the 3 world famous bookies who closed your account?
The one and only world famous book I would put my hands in fire that will never close or even limit account, no matter if you are a forever winner month after month (even if at the range of $10,000 - $19,000 per month) is Pinnacle.
Bet365, Centrebet(Largest Australian Bookie) and SBOBet.
Other bookies too, but not as huge as these ones. (Bwin, Marathon, Victor, Unibet, Expect, 10Bet etc.)
Pinnacle is by far the best bookie World Wide and you are right saying that Pinnacle will never close your account, but they limit too and it happened to me before.
The weird thing about Pinnacle is that they don't limit your account while you are playing(Even if you are winning a lot), but they do limit after you make a withdrawn(1 per month is FREE).
The best bet for a professional gambler is Betfair, that is not a traditional bookie, but a betting exchange where gamblers play against each other(similar to a stock market), and they only pay a 5% commission or lower on their winnings. This way you are able to bet -102/-102, while on the best scenario you bet -105/-105(Pinnacle for example).
The problem is that on Betfair there is not a lot of market on US Sports in general and almost 0 for Baseball, all the money goes between Soccer, Horse Racing and Tennis.
A Soccer Premier League market might close easily with USD$20 Millions traded, a Baseball game might close easily with USD$20,000.
Luckily living in Australia I have access to all the most world famous bookies, so I really don't know how it works with private or offshore bookies in USA, but from what I heard the odds and the conditions are way worst.
I traveled a few times in Vegas and on baseball it happens the same thing that you go through with the .com bookies. (On NFL is different)
If you bet a certain amount of money, I would say >USD$5,000 on a game, the sportsbook before accepting your bet will let you sign up for a "Player Card", where they can track your record and without that card they don't let you bet on the counter. Also, I remember one bookie(I think it is called CG Technology), doesn't let you bet on the counter at all if you bet a certain amount of money. They let you sign up to an online account and either with your tablet or on their monitors you log in and place your bets. (They automatically accept your bets for less than $20,000(At least on Baseball).
A Vegas sportsbook can easily limit your account too(I'm talking about Baseball.). I remember that last year I had a very good run while I was in Vegas and after like 5 straight wins, the bookie at the Caesars Palace was only letting me bet $2,000 on a baseball game, while on the first bet they were accepting up to $5,000. The Wynn/Encore were accepting at first $10,000, after a few wins only $3 to $5K. The Westgate(Old Las Vegas Hotel), was accepting at the beginning $25K and after a few wins only $5 to $10K. Same for the Aria and a few more. The only one that never limited my account was the CG Technology, and it was the only one that I had to bet "online" and not at the counter.
All this just to say that no matter how big and rich bookies are, they limit the accounts because they don't wanna lose, NEVER.
Of course a lot depends also upon the "risk" that the sportsbook is having on the game.
For example: If I'm trying to bet on Team B, and at that moment the sportsbook has $60K risk on TEAM A and $40K risk on TEAM B, I've more chances that they let me bet more money on TEAM B. If instead I'm still trying to bet on Team B, and at the moment the sportsbook has $80K risk on TEAM B and only $10K risk on TEAM A, my chances to get a decent stakes are very low.
So, I believe the two factors that matter the most are Your Balance on that Sportsbook(That's why they use the Players Card) and the exposure that the sportsbook has on that game.
GL guys!