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The gas cost to use ThorChain is 0.06 RUNE IIRC.

100 RUNE is enough to trade over 1500 times.
Considering I'm using RUNE for big trades I doubt I'll even do 100 trades.

I thought you're expecting RUNE price to go up and live a lifetime on it. :)

I'll get more RUNE when I can afford it.
I do think it's guaranteed to go up quite a bit.
The token mechanics create a black hole of infinite liquidity.