Well...yeah, you have a point about racing on them.
However, there is a side note to that. While the more ornate rotas, like the Tarmac 3, or the gravel, may be slightly overwhelmed on the track, the Boost, Slipstream, D2, etc, are perfect.
So I guess you might have a point when it comes to beating your rims to death on the track with hot brakes and everything else affecting them. For most people, they are more than adequate and IMHO are a very light weight low cost option to Volks, Gram Lights, Prodrives, and many others.
That being said, I'm not buying Rotas...not my style.