It's quite normal for a big stakeholder to write off when the company filed bk.
When GM filed bk, all its big stakeholders like big banks, funds, institutional, private creditors wrote off it.
In this way, they would make its balance sheets to look better later on.
Although DIP is irrelevant to shareholders, it keeps the company in operations and help the company to re-organize, and the common shareholders might have chance to get some shares in the new co.
Go check GGP: it filed bk and it went to $0.3, then it emerged with the common intact and now it $16. Wasn't it so huge ?
The chances are: you buy it at $0.16,
IF it's done completely, you'll just lose $0.16;
IF it could succeed in re-org, you'll be hugely rewarded.