Only advice I can give to people is to use the market as your inventory space. That is, toss what you haven't used without hesitation. EVERYTHING is functional as a non-durable good in this market, take advantage of it. Don't save that dodoskin set that your miner grew out of for the day you'll level botanist. Get rid of it and just buy a new set when you do. You save inventory and help a leatherworker out.

You've got the gil, I know you do.