There are some reasons to develop a virtual clone drive by ImgBurn team
As I've already said here, Nero doesn't support its own "Image drive" so there are a plenty Nero image files (*.nrg format) which users can't use them anymore, so if ImgBurn can develop a converter for this format it can be useful for a lot of user around the world. Also some other image formats like Alcohol images, etc.
If ImgBurn develop a converter and then a virtual image drive in one package, ImgBurn will have a complete package for Writing tools.
In this situation nobody use other writing tools....
As I know there are some converters for (*.daa) files but there is no "full package converter" OR "full package virtual drive" to support all formats or at least convert them to ISO format....
So ImgBurn can develop a "converter AND a virtual image drive" to support and convert all writing tools....