With the current reward curve, correct. Your vote could have a $0.01 impact if you vote first on a new post, but if that post reaches $100, the same vote would have a >1 cent impact.
With a linear system, whatever your vote adds to a post won't be static, because there is still the whole reward pool to be distributed according to votes. But it will be much closer to static.
Static is good for tracking purposes, but I see how it could be problematic for other aspects. I hope that all these factors are being looked at closely before making any major changes in the rewards structure. Thanks for the clarification.