Curious, is the number of computations capped in the network, or potentially infinite as well? Can multiple stakers compete for this 200%?
If multiple stakers compete for 200% then the quotient is lowered from 200% to, say, 180%. If all the stakers compete then it's back to 100%.
Hm, do they obtain 200% of their own stake relative to the network, or is the result a higher net subsidy created overall?
No subsidy in NXT, only fees. So it's not as big of a problem as it would be if there were block rewards that inflated the supply.
So, no incentive to perform this attack at all, other than temporarily centralizing it for the cost of power, or potential motivated destruction?
I suppose the solution toward removing it as a MAD attack vector, would be to introduce a subsidy.