Hi --
I've always got an eye on my wallet.
Usually, I tend to hang onto cars and keyboards for 5 to 10 years, especially when they are reliable and fit my needs. When a car or keyboard is 10+ years old, it's time to update/upgrade. Junk failing like water pumps, struts, front panel buttons, keys, etc. often hasten the decision.
Even though I bought Genos, I'll keep using the MOX on a weekly basis. The S950 should see some occasional work, too.
I don't jump at the newest and latest. That's why I totally respect folks who love and decide to stay with their T4, T5, S910, whatever. I'm thoroughly enjoying Genos. While getting my pop songs and registrations in order, I often run across a situation where "Darn, that old S950 voice sounds just fine in this context."
Genos is a musical instrument that I want to learn and master inside and out. A "buy and hold" strategy is consistent with this goal.
Just my personal approach -- YMMV.
-- pj