Warloch_Ahead: having to do double duty supporting different versions across several platforms.
This reason always infuriates me. You can't afford to support multiple platforms? Fair enough,
stay away from GOG until you are done patching your game and then release on GOG. At that point it's basically passive income, even if it's not a lot. And that leads me to:
Swedrami: - releasing it on GoG a couple months after the initial launch on the other platform, with more or less zero fanfare that it's now available on GoG as well
- taking it off of GoG again, citing disappointing sales as the reason
If you've already released it, just leave the damn thing be. Skip every other or every third patch if you REALLY have to, but publish the last patch you will ever do and then leave it be on the store!