I've been doing the same. My daily Hive income is less than yours, so I'm only buying 500 SPT per day, but same idea.
I don't really see much changing with SPT after the SPS airdrop ends. People will still blog a lot here, so I don't think demand will lessen any. You get more airdrop points for other assets, so I would be surprised if anyone is buying SPT just for the airdrop and therefore I wouldn't expect any dumping after the airdrop ends.
The more I blog here, the more I think this is the best of the tribes. The hyperfocus here around this one game makes this a very engaged community. LEO comes close, but there is much more energy and involvement here. That alone makes SPT a big win, I think.
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People love games. It's a natural match to have a place where they can talk about it more.
Maybe a 'forum' structure would help it?
I've often thought a Reddit-clone would do really well on Hive.