I have no idea, the levels at which various items become trivial is
different for different people, and I can't figure out what it depends on,
pie tins became trivial for me at 115, and for a fellow bard with the same
int wis char agi and dex (not sure about str or sta, but why would they
affect it?) they became trivial at 105. I am currently at one hundred and
thirty something in pottery, and using large bowls to increase my skill, but
I loose money on them, about one plat per run of 20. They might work, or
mixing bowls, but they are containers.