You would figure such a mass amount in 1 shot would be easy to sell. It "used to be" VERY easy... even charging more for a full 60k. You'd set someone up for a good year with something like that.
There is a seller at the Mini Mall who does sell bulk goods, via a vendor. They do sell.
Its something you may have to advertise at the bank, maybe.
Goodness knows... some things like Arrows and Bolts I'll never sell in bulk... because they attract a lot of traffic at the Mini Mall. hehe. Thankfully I have a few stacks. I think, in all, the player of today cant be bothered to make crafters. It can be a lot of work... and a lot of wood, leather, ingots... a LOT. Not to mention iron ingots are WONDERFUL to score city loyalty.