GOG seems to be considering paid membership option

Just did a GOG survey that focused on the idea of a paid membership option on GOG. Seems they're determining what people would be willing to pay extra for. Some of the options were

• a tool for backing up offline installers
• ability to install previous versions of a game
• extra insight into the preservation work they're doing.
• voting rights on games to bring into the preservation program.

And others that I can't remember.