The biggest bets I've seen were on JD... 7000+ BTC bets. Several times. (Well, it went up to 7000+ from around 2000+)
Was 7000 BTC a one time bet?
Yes it was. It looked like 2000, 3000, 4000, 5000, 6000, 7000. ... It's not 1 BTC done 7000 times, but several 2000 to 7000 BTC bets a few times.
You can find the details in
https://just-dice.com/biggest.txtbiggest bets in last 12 months
+-----------+-----------------+-----------------+---------+--------+---------------------+
| betid | bet | profit | chance | uid | date |
+-----------+-----------------+-----------------+---------+--------+---------------------+
| 152097271 | 7,016.28891331 | -7,016.28891331 | 96.2000 | 169618 | 2013-10-04 07:22:09 |
| 151926184 | 6,812.11702310 | 209.95278458 | 96.0400 | 169618 | 2013-10-04 05:14:25 |
| 151923159 | 6,602.24886053 | 209.86825940 | 95.9500 | 169618 | 2013-10-04 05:11:40 |
| 151919268 | 6,389.50987008 | 212.73911449 | 95.8100 | 169618 | 2013-10-04 05:08:05 |
| 151915792 | 6,177.17161758 | 212.33823588 | 95.7100 | 169618 | 2013-10-04 05:04:58 |
| 151914007 | 5,959.41068558 | 217.76091885 | 95.5100 | 169618 | 2013-10-04 05:02:56 |
| 151911481 | 5,519.94840009 | 219.73115077 | 95.2100 | 169618 | 2013-10-04 05:01:05 |
| 151911402 | 5,519.94840009 | 219.73115077 | 95.2100 | 169618 | 2013-10-04 05:01:02 |
| 151408897 | 5,304.10330755 | 218.09910565 | 95.0900 | 169618 | 2013-10-03 22:27:04 |
| 151406494 | 5,065.68648587 | 238.41673708 | 94.5500 | 169618 | 2013-10-03 22:24:13 |
| 151403104 | 4,825.19427115 | 240.49216990 | 94.3000 | 169618 | 2013-10-03 22:21:15 |
| 151397665 | 3,846.94273818 | 239.40201721 | 93.2000 | 169618 | 2013-10-03 22:17:37 |
| 151397027 | 3,846.94273818 | 244.23066127 | 93.0900 | 169618 | 2013-10-03 22:17:12 |
| 151396629 | 3,846.94273818 | 246.86927929 | 93.0300 | 169618 | 2013-10-03 22:16:57 |
| 151396071 | 3,846.94273818 | 247.74957520 | 93.0100 | 169618 | 2013-10-03 22:16:37 |
| 148620446 | 3,682.77897204 | 155.06436614 | 95.0000 | 169618 | 2013-10-02 08:21:04 |
| 148618898 | 3,533.97982021 | 148.79913916 | 95.0000 | 169618 | 2013-10-02 08:19:29 |
| 148612542 | 3,317.92314519 | 214.05956096 | 93.0000 | 169618 | 2013-10-02 08:12:55 |
| 148601047 | 3,116.83674877 | 201.08624487 | 93.0000 | 169618 | 2013-10-02 08:01:57 |
| 148591949 | 2,896.45431590 | 220.38240367 | 92.0000 | 169618 | 2013-10-02 07:51:03 |
| 148590882 | 2,513.90372740 | 191.27529235 | 92.0000 | 169618 | 2013-10-02 07:49:14 |
| 148590355 | 2,513.90372740 | 191.27529235 | 92.0000 | 169618 | 2013-10-02 07:48:31 |
| 148585325 | 2,336.15313005 | 177.75078975 | 92.0000 | 169618 | 2013-10-02 07:43:31 |
| 148584193 | 2,170.97057849 | 165.18255156 | 92.0000 | 169618 | 2013-10-02 07:42:13 |
| 148576957 | 1,767.51587669 | 134.48490980 | 92.0000 | 169618 | 2013-10-02 07:35:40 |
| 148575921 | 1,767.51587669 | 134.48490980 | 92.0000 | 169618 | 2013-10-02 07:34:53 |
| 148575723 | 1,767.51587669 | 134.48490980 | 92.0000 | 169618 | 2013-10-02 07:34:43 |