As an example, if you go from a 5000 polygonal model to a 2000 polygonal model then the number of vertices change. As a result, you would need to re-assign your vertices to your bones. If you go from a 5000 polygonal model to a 2000 polygonal model then the edge boundaries of the UV map will change and, as a result, the UV map will become a mess. The result is you will have to re-create the UV map or fix the problems on the current one. I am not saying this is difficult work. I am just saying that it is not as you say it is. I am not trying to stop anyone from using your services. I could care less if they do or don't. All I am saying is none of this (including what I am saying) has anything to do with the original intent of this thread, so perhaps both of us should just shut up.