Now, I could be wrong since I am not an "insider" , but reissues help pay for new tools, you have to figure that depending on how old the kit is, the company has made its money back, (or close to it) on that kit, so when the kit is reissued, its pretty much all profit at that point, think of it as fund raising for future projects.
Round2 I think has gone back and fix/updated some recent tools on reissued kits, and I know people have been very happy about that, and for a lot of people, maybe missed out on the first runs of kits, so its nice to have some kits reissued , but yes, I agree, sometimes it gets old seeing the same kit reissued time after time, but like already mentioned, if the kit brings in money, then why not right?.