It depends....
Different companies, different rules/attitudes and I can't speak specifically about the 'Sand Pit' but....
If you're bonded for 'type rating/line training' costs then this can make it more difficult to extract yourself from a contract, but not impossible. In some companies you pay the type rating training costs as they are incurred and they pay you back over a period. This usually happens to non-type rated FO's starting at the bottom.