Well, 2 things I have to say.
1. I didn't mean it like a useable item, i meant it as a hold item, that occasionally allows you to recover used Pokeballs AFTER your battle has ended. That was the idea that I ended up liking the best.
2. Maybe it's just me, but there are a lot of times that I've wished that Pokeballs didn't just disappear into the void. Especially early on when money is tight, so you can't buy tons of Pokeballs.