The main use-case I see for this is physical objects which already have a barcode. If you were going to go to the trouble of barcoding something yourself (e.g.

The main use-case I see for this is physical objects which already have a barcode. If you were going to go to the trouble of barcoding something yourself (e.g., business card), you'd be better off using a URL, where you'd be able to control what gets associated with the barcode, to say nothing of avoiding the chicken-egg issues with something like this.