They released Origin for Mac in Feb so you can now I guess, other than the crashing it works great on it! (: & Try that and see if it works, there's patches on the Sims3 site if not but I don't know if that will fix it for you or not since they never helped me much :/
I've gotta go ask my brother if my computer can handle this game........Looks like it could be so fun........
The Sims 3 on my sister's Mac has the problem no matter what though, like you, so I wish they'd fix that...
& Try that and see if it works, there's patches on the Sims3 site if not but I don't know if that will fix it for you or not since they never helped me much :/