From my point-of-view I like my car as it is. It's the closest I'm getting to a sensible family car!
I think with the Lexus brand, as is evident here, you have a wide variety of people, different ages etc who have spent a lot on their cars to begin with, so not everyone wants to go the modding route. A lot of people use their cars for business too, so it's not always the best way of creating the right impression!
You get more people modding the Fords, Citroens & Vauxhalls for example, because they tend to be younger people who spend less on the initial outlay of a car, and who want to stand out from the crowd. With Lexus, they tend to stand out well anyway - and if people are going to mod, it tends to be under the bonnet as some of the models can feel a bit under-powered.