I don't think it's a matter of people not using them, they don't exist in reality, or at least not for very long.
I'm not entirely certain a mod can "do" 230 watts, even for a second. Really, at those types of wattages I am pretty certain that they "fire" whatever wattage they can, even if it's not the actual wattage. I think when actually tested, they rarely do it (I don't test out mods that way, so I'm not sure).
Also, using that wattage (highest wattage) over any time period is just asking for a problem, hopefully the mod just shuts off and eventually dies electronically, rather than a battery exploding.
There is a thread on here about "over-rated mods" and the general unsafety of them but I don't remember exactly what it is called....
Anna