Yeah I thought about doing something like that,
actually vndb and the translators' home pages are pretty good at these things
in fact, you don't need to worry too much about it because when people really like something, theyll go out of their way to do research in order to buy it (i.e. go so far as to look at VNDB or the translators' homepages)
I have some other thoughts about this idea, maybe I'll come back and write more once i find time.