Well I can tell you it's worth it, at least for games on GOG, you get the full proper installer no hassle, DRM free, you get to choose your own box art and it's wonderful for games that don't get physical releases any more, it's a little costly, but it's less than the difference of actually buying a boxed copy.
Also here where I live we get these terrible cardboard boxes on a lot of releases and those both look ugly and stand out like a soar thumb on my shelf.