Rank 1 Bonanza prize. Doing a little math (and this is all unproven), we can determine if this prize could potentially be worth it.
Assuming this only dispenses Wailing Stones +2, it would have to give several of them to provide a meaningful return on gil.
Ex: 10 Wailing +2 stones dispensed on 1 charge (at current Asura price) = 2.5m/charge. x250 charges = 625M in total. This is just an example. You'd still have to sell them to make money, and that's assuming people care for these stones now. Since skirmish gear augmenting is currently outdated, I can't see this being worth it.
There's the possibility that this can drop any +2 skirmish stone, meaning you could potentially get pricier/more desirable or crappy/less desirable stones, which, again, you'd have to sell and pay AH fees.
TL;DR - Seems like a risky gamble to take this item. Pick a weapon instead.