More than that. I did the stonecrafting thing for a while. It's great for increasing wealth, nothing can match it,
Come now, you know that isn't even remotely true. I had 4 legendaries making some crafts for 3 years, and one season of sunshine/syrup roasts made triple the value. Only 2 cooks and a year or so prior of growing/brewing needed.
For another example, metal crafting or armorsmithing will also get you a ton more than stonecrafting. The only thing stonecrafting does is slightly lower the clutter by turning stone into something you have to store in masses of bins. This of course requires masses of bins and hauling, which is truly a pain. It is better to just quantum-dump the stone.
The only time stonecrafting is really worthwhile is when you have a ton of obsidian to work with. Even then, making something with a value multiplier is a much better use for obsidian.
One things that bugs me is obsidian short swords. They're made at an obscene speed and are worth less than their base materials (3+1)*(120) != 360
It should be the opposite, and it's a waste of material in terms of value created. If you don't watch out, a legendary stonecrafter will turn a whole stock of obsidian into more worthless swords than you'll ever need. Weapon trap material!
Anyway, the point is that stonecrafting is one of the
worst ways to make wealth. Unless your standard of wealth is 5million in 10 years.