From a new player perspective:
An auction house / market board would help balance prices, and would be much quicker and easier to buy/sell items and keep track of what is in high or short supply.
Having said that, I’ve thoroughly enjoyed going around and seeing the wonderful places people have built to display their wares, and if it weren’t for the need to move around to go and buy/sell items, I very much doubt I’d have had any interaction with other players for a long time.
I can not code for the life of me or anything of the sort, so I do not know how easy or if you even could implement this idea which kind of combines the two points above: Perhaps the creation of a search function for the item you’re looking for, which will give you results of shop stands with that item on, the sale price and the location of the shop stand, this way you can quickly find out where you need to go, and go there - If you’re not bothered about exploration, it can be as quick as just going and grabbing it, but if you are you get to see some of the builds and planets on your way through.
As far as generating currency for players outside of purely trading with others, some ideas as follows:
Edit the mint value for items to be closer (but still less than to create incentive for player to player interaction) to average market value. I’m aware this could be quite hard to maintain as it’s a player-run economy and prices can fluctuate all the time.
Adding coin itself as a drop from monsters / meteors etc. I would be against generic blocks unless it was significantly scaled down in comparison to monsters for example, due to the sheer ease of just going at it with a hammer/axe/shovel for hours.
Unfortunately I don’t really understand how Footfall works, so I can’t comment on that, but this is my view from someone who’s had the game for about a week now.