personally i'd rather buy a remix that is very different to the original track - i cannot see the point of putting out a remix that is almost the same as the original - i thought the whole idea of remixing was to see the different take that a fresh artist brings to a similar starting point ...
as to sampling offa da record - obviously you are gonna get a finished remix further removed from the original than if the parts are supplied and it requires a bit more input from the remixer ... we are working on a remix of a track four years old right now and the parts just were not there for the remix so we have had to sample from vinyl

whatever anyway it's all good if you ask me - just some of it is not to my taste

;)