It's been changed to 1-2 drops with a 10% RNG chance for 2. I had a simulation that I ran multiple times for some numbers a while before this change occured and the amount of times 2 or 3 rocks would show up was just as often, if not more often, than a singular rock would show up. Trees and Rocks had the same drop rates, and were given the same rates in this change as well.

TL;DR Even with the rate change it's still very easy to make money with both of the jobs in question.