I've been using frost badges on various alts to buy primordial saronites, which sell for ~1400 or so on Silver Hand. I also auction off cloth and chanting mats from green drops, but mostly vendor bop blues now as dream shard prices are 5g or less.

That's about all I do in terms of using the economy to make cash, up to about 250K g across accounts. The real question becomes what to do with the cash? Every toon that matters already has gear, a chopper, tundra traveler mount, etc.

WTB more stuff to buy!