If I was an art collector I would pay much more for the artwork now, for the simple reasons that

1. The girl with a balloon print was not the only one of its kind. There are other variations. It was not so unique before.

2. This is the only one, the first one, even the first (prominent?) artwork that "destroyed itself"

3. It is still an artwork. It did not destroy itself completely, but stopped in the middle of the destruction process. Doesn't it look great now, sticking only half outside the frame? Any museum of contemporary art would die for having this. And only this, not a similar one or the next one that destroys itself.