The problems of the market of yesteryear should be minimal as none of us are starting the market with billions of influence already on hand. That should naturally help keep inflation low. I know in the old days groups of marketeers would actively work to combat certain bad practices (ie if someone bought all of one set of salvage and reposted at triple price, and marketeers noticed, they would dump their salvage stores on the market at normal price to combat this tactic) and we need to get that going again.
Having said that, Don't be Ebil. You can still make a profit selling numinas for 10 mil instead of 100 mil. Maybe we can agree on some goals for marketeers in this new age, something like,
Keep prices reasonable, none of this winterlord baby sell the purple for 500 mil like we saw in the before time.
Keep the market stocked.
Help the less market savvy to get builds completed or get stuff sold.
The market, and farming, are as much a part of this game as pvp/base building/AE writing/PVE missions/RP and deserve to be treated with the same respect as do the people enjoying these activities. As marketeers, it is our job to help insure the health and success of the economy, help players complete their new favorite build, and keep things reasonable.
So don't be ebil.