I've long heard about C&C and would like to play it.
I'd love to be able to buy baby of your games on GOG; I might consider getting them on Steam if they're over 90% off... But I am certain to buy those on GOG, even with a less steep discount.
People are willing to buy the games again on GOG, despite having purchased them elsewhere. I sure am willing, at least.
And then there are people who just aren't going to buy anytging outside of GOG (I know such a person).
While these might be anecdotal examples, these are revenue streams that aren't being utilised by you.
