The only counter-argument is, that the user has to know which program he needs, how to create a virtual CD drive with it, how to mount an image and has to do it, or has to know which program he needs, how to burn an image to CD with it and has to do it. And even when he knows, it is more complicated than download and play or download and play with DOSBox, a simple and widely familiar program (which you also have to use when you have an image). But after all I'm for offering games as original as possible.
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