v.129 - Mark of Honor: Kanna Update Highlights

Not exactly. They've only increased the maximum once, from 15 to 18.

I can't figure out why they do this. If they increase the max to, like, 32 now, what do they lose? There are no free coupons out, so people who want to make a 19th char now - maybe one of those classes that will be unavailable after the patch - will have to pay NX for it. Profit? Profit.
If they increase the max by one each time, and give out a coupon for that one slot, they are denying themselves the option of selling char slots. That's plain dumb.

I have to agree with this, there is absolutely no disadvantage to them increasing the slots.
You usually have to pay for an extra slot, the character created in that slot will probably require funding at some point, it's all profit for them, so it's weird that they are being so tight-arsed about it.