I caught 100x and I have watched it going to 1200x but sorry to say every time it touched highest I didnt see any bet. I meant to say it goes alone without having placed bets . May be some one succeed to catch that high but I didnt see.
The reason you never see anyone cash that high is because no one has any balls.
Historically there have been a few players who cashed out that high. However, mostly doing dust bets. These are all historic cashouts at or above 1000x:
username | cashout | wager | game
----------------+---------+-------+---------
Gambletron5000 | 2500 | 10 | 604396
yujinbojee | 1285 | 10 | 622528
yujinbojee | 1185 | 3 | 620219
fanbox | 1151 | 1 | 527994
MathWins | 1000 | 10 | 603783
btcpizza | 1000 | 5 | 638302
kicken55 | 1000 | 10 | 600008
220 | 1000 | 20 | 1010596
Ghris | 1000 | 10 | 704245
220 | 1000 | 100 | 1009149
Ghris | 1000 | 10 | 703039
sureshnsnet | 1000 | 1 | 950338
Ghris | 1000 | 10 | 704435
sureshnsnet | 1000 | 1 | 957394
MathWins | 1000 | 10 | 603130
MathWins | 1000 | 10 | 604396
(16 rows)
The wager is in bits. Of these 220 had the biggest profit: 99.9k bits + 1.89 bits bonus in game 1009149.