For people with 1000+ hours on TS4 -- What keeps you playing?

For me, it's all been about CAS 80% of the time; I just find some solace in creating Sims, and challenging myself to make newer and better Sims and try putting on things for them I haven't used often. I can visualise their character this way, and then I let them wander off in the worlds as I plop them down and play naturally, which usually ends with me enjoying the background while playing half the time. It tends to be relaxing, bugs notwithstanding.