I spend up to 4m on random stuff often.
When there is mass quantity of items there becomes no market for it. Which is why some thing’s wont sell.

*Edgeville-Clean up a little.
Remove alter near wild in edgeville, there is already one in a church near Oziach.
2 Make-Over mages in Edgeville Suggest to only have one if not none at all in edgeville.
Players should have to walk to where the make-over mage is normally located to give the real feel of RSC.
2 Master fishers in edgeville - Remove one and keep one - Change the free fish to cooked shrimp - Change location to lumby for starter food for new players. No trout or salmon, player can level up fishing or purchase from another player if in need of better fish.

*Auction House remove Npcs out of all banks.

*Add more Auction Houses
Which I see only one is located in Edgeville.
An idea on expanding the auction house in other towns would be a good idea.
Varrock North of West Bank a building with Auction House like whats in edgeville in replace of the water.
Falador west of general store there is some empty area there to place an auction house.
Lumby Auction house-Found it-Replace the Auction house that is current in lumby with the general store an expand the size of the building where the general store is with Auction House with treasure chest like edgeville. One Banker for the only town that has combo of Auction house NPC and Banker NPC in it. Other towns already have banks.

Altar was added to spice up border pking,  keep it.
One auction house is plenty, this keeps edgeville busy,  we've suggested multiple times adding a banker to it.
Make over mage is placed temporarily in edgeville to allow transferred characters to change appearance.  Keep it until transfer window is over. 
Keep master fisher as is.

If you're expecting a thriving economy,  sorry.  Just not going to happen with 40-50 people online.  Best bet is to login on multiple accounts and play ironman style.
If you are looking for things to sell, fish swordfish,  there will anyways be demand for these.

I spend up to 4m on random stuff often.
When there is mass quantity of items there becomes no market for it. Which is why some thing’s wont sell.

Don't have smithing and mining events that last for 6 weeks then...?

The DM Arena skilling area was implemented to kind of “hold over” players while waiting for the updates, and also to help newer players from transfers catch up on things. It has since been nerfed and will mostly stay that way from now on with the exception of a few events.

Don't get me wrong Lorin, these events were needed to keep the current loyal fresh start server guys happy. It has run its course and i'm glad it's been nerfed.
Now un nerf them soul runes!