Thats the point, is for the Orks to have overwhelming ranks. Thats what they have in fluff, why not in game? Whenever people inevitably start buying the Eldar (which probably won't be that many people running about, but i've been wrong before), Chaos and regular space marines, the Orks advantage in numbers will still be there, it just won't be as one sided as it seemed at the start.
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R.I.P. Uncle Lee. You will be greatly missed by us all. We will see each other again some day.
Remember kids: Violence isn't the answer, its the question. The answer is yes.