Disposable Razors VS Razers with Changeable Heads....

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So I know that the right thing to do environmentally would be to but a razor with changeable head and just buy the cartirdges, therefore making less garbage. However, I will never do that, because for some reason that I cannot even begin to understand, razor head cartridges, in any brand, are about twice the price of the same number of disposable razors of the same variety. How is this possible? I but Bic Soleil disposable razors, that have a nice heavy handle, that is very much the same as the handle that you get for the changeable cartridge razors. So how can the company offer a package of 4 complete razors for less than they charge for just 4 razor heads/cartridges? It takes more material to make the full razors. I personally can see no difference between the heads of the disposable razors, and the heads for the other razor, othen that the little clips that let you attach the heads to the handle. You would think that the disposable razors would cost more. It makes no sense to me. Can someone please explain this phenomenom to me?