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They can't be expected to stay that way forever.

Actually, one was fully designed around that concept. :)

Increasing the cost of these is rather silly I think. It's a low-save utility that really is only useful in an ambush / post dispelling (assuming they don't drink another potion between rounds) style. I have used these many times over and as stated, a mind-effecting save is pretty easily overcome and you'll often have a low chance of success with it. Even if it is successful you lose the first round of attacks due to nwn mechanics and that leaves you with 4 rounds to subdue a target, who if they failed the save, likely has high AC and hitpoints as well.

EFU is already heavily in favor of pure AB classes as far as consumables go and I think, if anything, wands in general should be a little cheaper to help motivate a more dynamic range of 'successful' character options.

There is also an item in game that seems to be more and more common with immunity to hold person on it.

it's fine as it is and there is no good reason to adjust it.

Why not just remove them? Enforcing their use is kind of silly and will come down to Stygians trying to enforce petty little details that they ICly probably don't even care about.