it already is in, and you are leaving out some factors to consider. The item costs a lot to produce and is not at all easy to make. This is a rending curse/situational item and considering its cost to make, is not overpowered at all.
Since it was asked for: one combine atempt costs ~450pp, and combine gets never trivial.
I am surprised these are not widely used already, I would think that most raid guilds would require you to keep 3-4 on you at a time. could see most people paying 800-900 for it though. I still think a more balanced version would be what I suggested before. Especially with casters.
This has 2 reasons:
1) noone but me can try the combine
2) one of the ingridients can not be obtained any more
so technically it's a discontinued item?
Exactly my thought, and the reason why I started this poll.So it's a worthwhile length fulmination (as opposed to fulminations short length) with one charge that runs at least 500pp (tiny tiny profit margin added, no consideration of fails, unrealistic pricing I know)
I highly doubt you're going to find a market of even moderate size for those, so far the poll seems to come to the same conclusion.