UO Second Age

I am to the point to where I am so proficient at crafting items for Tanners - that they buy my stuff for next to nothing. I work through all 8 known tanners in a cycle. But their refresh rate on what they buy can no longer keep up with my production rate. Is there any chance of increasing or keep them from hindering the price on what they buy when sold in bulk?

I've posted something similar, it seems like the turnover on leather item goods vendors is much slower than the turnover for other vendors ie. wepons/metal armor/clothing