Considering HoloZing paying 7.5% to delegators, I'd say it is more than fair. Most posters probably delegate too, it's a sneaky way of getting extra return but you would have to make quality posts. I do it with @worldmappin , where they at least power up your share of the delegation rewards so it would take a while to power that down and profit.
One day I will post in HoloZing too, but for now shhh!
I don't think so actually. The APR fluctuates based on price, there was a time it was higher than curation returns and many used to instantly sell their token earnings for a few % profit and undelegated after it dropped under, but that's all still working as planned and they contributed to the funding of the game. You could say right now only the die-hard fans are still involved since just autovoting and using the hive to buy zing is technically cheaper but who knows when that may change!
Looking forward to your post, hopefully a first impressions review about the game soon!