Just as stable and safe as the original garrysmod, but it restrics some things:
Not allowed any addons
Can’t play multiplayer
Can’t mount anything but HL2. EP1, EP2 and Lost Coast
No custom maps.
Only lasts a week
I think it would be a good idea for people to try out the mod before buying.
10$ is fine and gmod attracts a very specific type of crowd. Most people get the idea after reading about it and watching some videos. Besides, taking out a lot of the stuff you mentioned kind of ruins the gmod experience