I agree its certainly possible that we see a $5 million market cap. In either case Splinterlands growth has been nothing short of amazing.
You're correct to say that those upvoting from Splintertalk.io (who have SPT staked) will award SPT tokens but the upvote doesn't need to come directly from the SPT site. If someone has SPT staked and upvotes content that contains the SPT tag it will still award SPT tokens to the author of said content regardless of what font end the user upvoted from.
The upvote part I am uncleared. So even if the post has a tag for some other token like palnet it will work the same? I upvote on steemit but earn palnet token if the post has palnet tag? Apologies for the dumb question.
Not a dumb question at all.
As long as content contains tribe tags and the person upvoting has said tribe token staked it will earn tribe tokens.
So for example, I could create a post on Steemit and tag Palnet / SPT and Battle and I will earn each of those tokens when getting upvoted from those who have them staked.