FIFO mode for at least some marketboard items?

[Shurrikhan]

I'd be happy if there was some kind of consequence to adjusting prices constantly like a cooldown on doing so or whatever. You shouldn't be able to constantly change prices. Or if you do maybe a fee based on a percentage of the sale attached to it. Either way the competitive items tend to race to the bottom and become worthless way to fast in this game. It makes selling a pain in the ass. Buying it's great because most competitive items quickly become worthless. But for a market system I hate this games the most.

Easiest way to stop the rapid price-changes would be to charge sellers a deposit when listing the sale, but that creates its own price-lowering pressures.