Well, for hardcore players who were among the first to 70, there were a ton of moneymaking opportunities that could fund heavy raiding for a long time to come, even without any kind of guild bank support. We had one of the first jewelcrafters to 375 skill, who bought all the blue gem designs he could when they were cheap, and he made an absolute killing before the market became saturated. Same with people who farmed pre-nerf elemental plateau when there were a handful of 70s, total, on the server, and hoarded it all for later resale. Imagine being an herbalist when you are one of a dozen people on the server with a flying mount.
There's a clear lack of high level greens that nuke to Large Prismatic Shards (like BWL greens used to sometimes nuke to large brilliants). I now posses 500+ dust and essences but something like 2 shards, from 4 weeks of double-teaming Karazhan. I've always liked to had out free enchanting mats to raiders but now i have to tell them to go find their own prismatics.
as for consumables cash, i'm guessing that the "uberguilds" clearing current content with gay abandon are running down their pre-TBC coffers? Short of selling 2 epics per week from Chess I don't really see anything particularly lucrative for raid guilds.
Personally, I hit 70, ran heroics nonstop, and ended up with 30-something Primal Nethers and nothing to use them on. I picked up some epic weapon plans, and now I'll soon have >4k gold after buying my mount. I don't like consumables, but I can certainly sustain heavy use of them for quite a while to come.