Request Board

[Rilne]

You're mistaken if you think that will set a floor on board prices though. I've seen people selling stuff for 1 gil on the boards.

I said "extremely useful", not "will absolutely", but point taken, people can always be idiots.
That said, if sell orders are auto-matched with buy orders (as a proper commodities market should), then it does become a floor, at least until all buy orders are filled. By auto-matched, I mean if a sell order is posted for x/each, and there exists a buy order at y/each, if y >= x, the buy order is fulfilled directly from the sell order. A proper market should make this process automatic and transparent.