I went into it slightly later, spent probably about 100 Hive in total, then sold shortly afterwards for probably a similar rate of return to you.
I had to get out of the game I found it quite anxiety inducing with my daily return being linked to my ranking - too much pressure to log on every day and just buy more cards.
I mean, I know that's how it works on Hive anyway - the more you invest, the more of the share you get back, but having it 'in your face' like that in the form of a game was just too much!
Also, it's not really my kind of game anyway.
I'm wondering if we'll ever evolve beyond card games on Hive, they're all just card games at the end of the day.