A new build on the PTR for patch 4.0.6 has listed the new prices for grey artifact items when grinding archaeology.
Don’t get too excited however, the amount of gold one could hope to gain per hour is still a measly 140g but the increase in prices are large, between 1000% – 3000% increases.
This change won’t be implemented until 4.0.6 launches, so be sure to keep any grey archaeology items you may have in the bank until then.
MMO-Champion has listed on a nice chart the current prices of each grey and the changes in the new build, go over and check it out.
As for a gold making method, 140g an hour is way behind any other kind of gathering you could do or crafting profession, however there are a large amount of people who do this profession for the rare weapons and this change will help pad their pockets a little bit.