I will give my opinion since you asked, but I'm warning you, it's what you paid for it!

If a vintage razor has great condition original scales, then to me they add value. Not neccesarily monetary value, but historical value.
If a vintage razor has busted up or poor condition scales, then I would rather have a set of new scales made in the same pattern with new period correct materials.
If a vintage razor has replacement scales that "speak to me", then I'll keep them. If not, then they come off and period correct as close as possible original material and shape scales get made and go on.

I love razors for their historical value (again not necessarily monetary.) I am only collecting blades that are pre-1850ish. I may be missing some awesome 20th century steel, but I'll be ok.