It also depends on what you use the car for. Most of the expensive wheels are made and tested for extreme track use. If my car was a dedicated track warrior, I would fork out the extra grand for a brand name, which I know will hold.
That doesn't mean xxr and rota wont withstand the track, but we've all seen or heard the horror stories with the cheaper wheel alternatives...

When people are putting $2-4k in wheels for their DD, this is a little absurd.