I tested this myself in-game... It turns out that, if you keep throwing the infini-item, it'll actually sometimes reset to a stack of 128 items... o_O No word on if they can actually be sold, though. I'd suggest for all that read this to not try to sell them, though, since 1) It's most likely illegal, since it's practically duping items, and 2) Even if it works, it wouldn't have any good payout at all