Apologies in advance; this topic has kinda been done to death but this is hopefully a slightly different take on it. 
I generally prefer to buy games at retail. I like to have the boxes, manuals, game already backed up on a disc etc. It's also usually cheaper, disregarding sales. I'm not here for the "retail/download is better" argument.
What I've been thinking lately, though, is about the cut the developer or publisher gets. I'm sure someone here knows the figures involved but I think it's something crazy like a 30% cut at retail vs a ~70%? cut if downloaded via Steam, say.
So could it be argued that buying at retail in this day and age is irresponsible? If I care about the dev/publisher (in the case of publisher I'm thinking more Paradox than, say, EA) shouldn't I be buying directly from them, preferably, or from somewhere like Steam or Gamersgate so they get more cash?
Opinions welcome!

I generally prefer to buy games at retail. I like to have the boxes, manuals, game already backed up on a disc etc. It's also usually cheaper, disregarding sales. I'm not here for the "retail/download is better" argument.
What I've been thinking lately, though, is about the cut the developer or publisher gets. I'm sure someone here knows the figures involved but I think it's something crazy like a 30% cut at retail vs a ~70%? cut if downloaded via Steam, say.
So could it be argued that buying at retail in this day and age is irresponsible? If I care about the dev/publisher (in the case of publisher I'm thinking more Paradox than, say, EA) shouldn't I be buying directly from them, preferably, or from somewhere like Steam or Gamersgate so they get more cash?
Opinions welcome!