So what do you think would be the commercial limitation? As we established it looks like the market can absorb a few wizards with fabricate, as its still a very small increase in the supply of crafted goods. So to my mind either there is enough market for the wizard to sells all the goods he makes, or a few regular crafters go out of business and the wizard takes over (due to speed and consistency of product, and could probably undercut the regular craftsman, after all they are making enough to afford it).Thus, 1250 GP income per year from normal crafting. Fabricate bypasses that, but would likely be commercially limited to about 10x to 20x that amount.
Again, not enough to ruin the economy as you have well established, but probably enough to ensure the wizard could make more money than even seasoned adventurers make.