A year's Cinema 4D commercial is less than 1/3 the cost of a year's Maya full commercial, even before the discount. I that so terrible ?
£462 for a year with the discount seems pretty decent to me.
Just guessing here, but the support could just be free subscriptions as prizes, which essentially costs them nothing. Also, if youre going to spend money, spend it on people you want to become your customers, not people who already are.