NO, most people (myself included) don't have the tools / skills / time required to make three racks for the money... Dont get me wrong, there is nothing wrong with home made racks, but don't fool yourself. Seldom is a home made rack even close to equal to the quality of Riches racks (he does after all sell enough stuff to make a living out of it).
With few exceptions, I can tell you that the odds are my "waste of money" racks will still be fully functional and in use long after most home made racks die.
RBI racks aren't cheap, but they are dollar for dollar the best value for most people like me.