What everyone else is saying is that it doesn't matter, because you could already by the Tomes of Power in infinite supply for less than any of these tomes are selling for, and Tomes of Power, unless you are an enchanter, are pretty much always going to be massively large huge gianormously more beneficial and powerful than any of the other tomes. The general tomes are so abundant right now b/c, as Nwaij put it, everyone that can go to ikisith does, and also because the people that can use the tomes have, by now, hoarded enough to keep them happy for a while. This means that the people who can use the tomes and already have them are selling them, while the people who can't use them yet are selling them as well.
A lot of people underestimate just how amazing tomes of power are. These ikisith tomes are essentially requiring you to spend a decent amount of money and 50 to 100 or more AAs for a benefit you can usually get from just a handfull of AAs for free. On top of that, on most of these tomes, you're going to have to complete an opus before you've regained the power lost from tomes of power being adjusted, and the opus, it be scarce.
To put it in perspective, for a grand total of around 8k or so, you can increase your healing, melee damage, and spell damage (all three) by 20%, and all you have to do is be able to walk into erimal. Going by average market prices at the moment, you could also choose to take that 8k and buy 1, possibly 2 pieces of fairly decent gear with a 55 lvl rec, or you could buy a tome that gives you a total of +4 resists, or allows you to raise the hidden strength cap on one stat by 10. (meaning basically +3 to that stat, if you can manage to get it to 495). Or you could buy a tome that increases your damage of one element type by 2% (half of a codex of power, which costs around 1600 plat by comparison, and increases ALL damage by 4%).
tl;dr: Ikisith tomes aren't going to break the game at all, despite appearences, and aside from a few special instances, unless you're doing some pretty dedicated raiding, the end result is going to be a more flavorful and fun near-restoration of power lost from tome of power balancing. So it's really ok if there are lots of them.