Apparently they are compatible with modern operating systems but I'm wondering to what degree and if the modded releases fans put together are going to be better in some aspects.
Apparently the Sims 1's UI is having scaling issues but at least there's no EA launcher.
I bought almost all of the Sims 3 dlc on a fire sale years ago on steam. I think I paid maybe $100 for the whole kit and kaboodle, including base game. There's a few that have come out since but I never felt like I needed them so I didn't buy them.