Near instantaneous pixel response time (practically zero ghosting), deep blacks which allows for high HDR support.
I think they really aren't worth the money at the moment. And that is coming from someone that paid that price for G-Sync when it was new. When you can pick up a decent IPS or VA panel for $300-400 I don't think double the price or more is worth it right now.
Your plan to replace it before burn-in would say it would be a relatively short term, which makes it quite wasteful. Whereas I still have my PG279Q just about 8 years later. Or around $100 a year.
I would say if you play a lot of games with persistent game menus and the like, you probably want to avoid OLED for now. But if you swap games regularly during the day or your games don't have a lot of the same pixels in the same places it would be relatively safe to use.
If it were $500 I would say go for it, but not at $800-1000