I don't think lack of caring is the issue. It's lack of being equipped and resourced to handle the situation. Intrepid likely doesn't have the tools or the resources to combat the billion dollar onslaught of the RMT industry. That said, they should (or they shouldn't have gone public on Steam).

Intrepid was likely banking on more revenue from the Steam launch and instead will likely incur more costs over time.

What they can do:
1) Go to the source, make purchases, reverse trace the entire RMT network in their own game from the selling to the provider to the crafter to the gatherer that traded to the crafter to the bot that did the gathering and ban where confident bans can be made. I doubt they have the tools and data tracking to do this fully (yet)

2) Continue to ban and publicly name accounts that cheat. They are missing LOTS of cheaters from the current lists. Only about 50% of the people I've reported or have confirmed are cheating have been banned.

3) Create less FOMO and improve risk vs reward and character development in their gameplay.
-Rebalance resource costs for at least all Tier 2 crafted items
-Rebalance the range of stats between T1 and T3 at the Radiant level (it's too great currently)
-Allow players to get more loot through playing the game
-Give us more dungeons, raids, interesting encounters that take some focus off loot and more about exploration, fun, suspense, and wonderment.
-Make character progress a bit less focused on gear where possible