Not an annoyance for me, I have extraordinary amounts of patience because of a large number of games I still haven't played yet. :)

Patience is a virtue.

It depends on the person, of course, with my backlog I personally rather wait for the GOTY/Collector's/Complete/Limited/Whatever edition at a large discount unless I want to play the game immediately, which rarely happens, or I want to show support for the developers/publishers, which is happening less and less.

It's only a matter of (little) time until Batman will be available on gog, at least the first one, City or whatever the name is.
If I were you I would not buy from the bigger shop. But if you want to cave that's your decision to make.

Wait? Annoyance?? Who says anything about "waiting" to play a pitiful game? Do you really think that I wait on my chair in front of my computer, biting my nails in despair and with the credit card ready to be used the moment a "game" is available day zero?
I have so many nice things to do in real life and when occasional in virtual I have a big backlog of even nicer games waiting their turn to be played.
I own and control my "things" not the other way around, therefore that insect-that-I-could-crush-under-my-boot-game (shodan trade mark) can patiently wait its turn until I show a little bit of attention on its meaningless existance.