Imagine the situation:
Someone is buying 10 blueberries for 1 coin on the market. You would like to buy a tree planter's pot that cost 15 coins. Actually, you would like to buy 4 of them. That is 600 blueberries to deliver to the market. Your max capacity for 1-time travel is around 165 (your inventory, 2 large chests in a boat that you risk to be stolen at the theft-zone). Even if you would bring 2 bulls with you with packed stuff in them, it is still painful to get that 60 coins. Imagine, if you need more items, like herbalist tables, seeds, water and etc. You would have to spend a lot of time on travelling, packing, risking your items, waiting for your character to restore travel weariness (probably you can do only 1 travel at a time), and you do not have that much free time to spend on trading. Your crops are already grown, cattle is starving, characters need to be fed with curios. Oh! You have made all the way down to the market just to find out, that some other f... fella just sold a bunch of blueberries and the barterstand cannot receive any more blueberries. The day is ruined.
Now, you're the trader who wants to deliver goods to the market. You would sell some stuff like raw meat, hides and etc. for really cheap prices. You have a lot of rubbish in your village piling up and being thrown away, although you could have sold them and make some profit. However, the travel and the effort just kills your motivation to move. Better to sell something that costs very high (jewelery, clothing and etc.) than make 4-5 trips for the same amount of coins by selling some stuff like boards. Consequently, the prices on the market are very high. The poor noobs also have to make more travels to get their items.
Imho, we should be able to package the stuff we would like to deliver, so we could transport more items per travel. Maybe even the packages could be sold to the barters, making both the trader's and the noob's life easier.
You should be able to package your items at a packaging workstation. The packaging consumes hides and allows you to compress 5 or more slots in 1. Unpacking leads to the hide being destroyed (item sink!) and the items unpacking to your empty slots or dropping on the ground. Consequently, you could save a lot of travel weariness and sell 600 berries within 1 travel. Everyone is happy! Improving the travels and item transportation would help the trades a lot, making the prices more affordable, higher range of items being sold and etc.