I think six month exclusivity, the same as the content, is good incentive for people to buy the expansion bundles. After that I think they should be sold individually in the cash market. By breaking up these items and selling them as stand alone purchases, Standing Stone Games could make more money on these additional items collectively than they would by simply bundling them. Plus, there are people who have no intention of buying a $120 dollar expansion but might pay 20-40 for the base content and then an additional asking fee for a permanent hireling, or a teleport object, or a particular sentient jewel, etc. And customers may come back later and buy the other items that they did not the first time around, generating even more sales revenue.