I have the Silver Shovel and occasionally my Money Rock spits out ore. However, what is the benefit of having ore come out rather than money? It doesn't seem to have a large impact on my bells as there is usually a small difference between full Money Rock (all 16,100 bells) and Ore Rock (18,000-ish). I guess every increase is a good one, but it seems like so little. Not to mention, it takes quite a bit of space out of your inventory.